Update quantization round and clip calculation rules (#42695)

paddle/fluid/framework/ir/delete_quant_dequant_filter_op_pass.cc

@@ -45,6 +45,10 @@ DeleteQuantDequantFilterOpPass::DeleteQuantDequantFilterOpPass() {
       .End()
       .AddAttr("bit_length")
       .IsIntIn({8, 16})
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsIntIn({0, 1})
       .End();
   AddOpCompat(OpCompat("fake_channel_wise_quantize_dequantize_abs_max"))
       .AddInput("X")
@@ -61,6 +65,10 @@ DeleteQuantDequantFilterOpPass::DeleteQuantDequantFilterOpPass() {
       .End()
       .AddAttr("quant_axis")
       .IsIntIn({0, 1})
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsIntIn({0, 1})
       .End();
 }
 // Delete quant_dequant_op, then quantize and dequantize weight

paddle/fluid/framework/ir/delete_quant_dequant_linear_op_pass.cc

@@ -54,6 +54,10 @@ DeleteQuantDequantLinearOpPass::DeleteQuantDequantLinearOpPass() {
       .End()
       .AddAttr("quant_axis")
       .IsType<int>()
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsType<int>()
       .End();
   AddOpCompat(OpCompat("dequantize_linear"))
       .AddInput("X")
@@ -74,6 +78,10 @@ DeleteQuantDequantLinearOpPass::DeleteQuantDequantLinearOpPass() {
       .End()
       .AddAttr("quant_axis")
       .IsType<int>()
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsType<int>()
       .End();
 }
 // Delete quantize_linear_op dequantize_linear_op, then add input_scales

paddle/fluid/framework/ir/delete_weight_dequant_linear_op_pass.cc

@@ -52,6 +52,10 @@ DeleteWeightQuantDequantLinearOpPass::DeleteWeightQuantDequantLinearOpPass() {
       .End()
       .AddAttr("quant_axis")
       .IsType<int>()
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsType<int>()
       .End();
   AddOpCompat(OpCompat("dequantize_linear"))
       .AddInput("X")
@@ -72,6 +76,10 @@ DeleteWeightQuantDequantLinearOpPass::DeleteWeightQuantDequantLinearOpPass() {
       .End()
       .AddAttr("quant_axis")
       .IsType<int>()
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsType<int>()
       .End();
   AddOpCompat(OpCompat("conv2d"))
       .AddInput("Input")

paddle/fluid/framework/ir/quant_conv2d_dequant_fuse_pass.cc

@@ -49,6 +49,10 @@ QuantDequantFusePass::QuantDequantFusePass() {
       .End()
       .AddAttr("bit_length")
       .IsIntIn({8, 16})
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsIntIn({0, 1})
       .End();
   AddOpCompat(OpCompat("fake_quantize_moving_average_abs_max"))
       .AddInput("X")
@@ -85,6 +89,10 @@ QuantDequantFusePass::QuantDequantFusePass() {
       .End()
       .AddAttr("bit_length")
       .IsIntIn({8, 16})
+      .End()
+      .AddAttr("round_type")
+      .IsOptional()
+      .IsIntIn({0, 1})
       .End();
   AddOpCompat(OpCompat("fake_dequantize_max_abs"))
       .AddInput("X")

paddle/fluid/operators/fake_quantize_op.cc

@@ -88,14 +88,14 @@ template <typename T>
 struct ClipAndFakeQuantFunctor<platform::CPUDeviceContext, T> {
   void operator()(const platform::CPUDeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, framework::Tensor* out) {
+                  const int bin_cnt, const int round_type,
+                  framework::Tensor* out) {
     T s = scale.data<T>()[0];
     T inv_s = inverse(s);
     platform::Transform<platform::CPUDeviceContext> trans;
     trans(ctx, in.data<T>(), in.data<T>() + in.numel(),
-          out->mutable_data<T>(ctx.GetPlace()), phi::ClipFunctor<T>(-s, s));
-    auto out_e = framework::EigenVector<T>::Flatten(*out);
-    out_e.device(*ctx.eigen_device()) = (bin_cnt * inv_s * out_e).round();
+          out->mutable_data<T>(ctx.GetPlace()),
+          QuantTensorFunctor<T>(static_cast<T>(bin_cnt), round_type, inv_s));
   }
 };
 
@@ -105,16 +105,17 @@ template <typename T>
 struct ClipAndFakeQuantDequantFunctor<platform::CPUDeviceContext, T> {
   void operator()(const platform::CPUDeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, framework::Tensor* out) {
+                  const int bin_cnt, const int round_type,
+                  framework::Tensor* out) {
     T s = scale.data<T>()[0];
     T inv_s = inverse(s);
 
     platform::Transform<platform::CPUDeviceContext> trans;
     trans(ctx, in.data<T>(), in.data<T>() + in.numel(),
-          out->mutable_data<T>(ctx.GetPlace()), phi::ClipFunctor<T>(-s, s));
+          out->mutable_data<T>(ctx.GetPlace()),
+          QuantTensorFunctor<T>(static_cast<T>(bin_cnt), round_type, inv_s));
     auto out_e = framework::EigenVector<T>::Flatten(*out);
-    out_e.device(*ctx.eigen_device()) =
-        (bin_cnt * inv_s * out_e).round() * s / static_cast<T>(bin_cnt);
+    out_e.device(*ctx.eigen_device()) = out_e * s / static_cast<T>(bin_cnt);
   }
 };
 template struct ClipAndFakeQuantDequantFunctor<platform::CPUDeviceContext,
@@ -124,7 +125,7 @@ template <typename T>
 struct ChannelClipAndFakeQuantFunctor<platform::CPUDeviceContext, T> {
   void operator()(const platform::CPUDeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, const int quant_axis,
+                  const int bin_cnt, const int round_type, const int quant_axis,
                   framework::Tensor* out) {
     // At present, channelwise quantization supports conv2d, depthwise_conv2d
     // conv2d_transpose and mul
@@ -145,15 +146,10 @@ struct ChannelClipAndFakeQuantFunctor<platform::CPUDeviceContext, T> {
         T s = scale_data[i];
         auto* start = in_data + i * channel_size;
         auto* end = in_data + (i + 1) * channel_size;
-        trans(ctx, start, end, out_data + i * channel_size,
-              phi::ClipFunctor<T>(-s, s));
-      }
-      for (int64_t i = 0; i < channel; i++) {
-        T s = scale_data[i];
         T inv_s = inverse(s);
-        framework::Tensor one_channel_out = out->Slice(i, i + 1);
-        auto out_e = framework::EigenVector<T>::Flatten(one_channel_out);
-        out_e.device(*ctx.eigen_device()) = (bin_cnt * inv_s * out_e).round();
+        trans(
+            ctx, start, end, out_data + i * channel_size,
+            QuantTensorFunctor<T>(static_cast<T>(bin_cnt), round_type, inv_s));
       }
     } else if (quant_axis == 1) {
       const int64_t step_i = in.numel() / in_dims[0];
@@ -165,10 +161,9 @@ struct ChannelClipAndFakeQuantFunctor<platform::CPUDeviceContext, T> {
           auto* start = in_data + i * step_i + j * step_j;
           auto* end = in_data + i * step_i + (j + 1) * step_j;
           auto* cur_out_data = out_data + i * step_i + j * step_j;
-          trans(ctx, start, end, cur_out_data, phi::ClipFunctor<T>(-s, s));
-          for (int k = 0; k < step_j; k++) {
-            cur_out_data[k] = std::round(bin_cnt * inv_s * cur_out_data[k]);
-          }
+          trans(ctx, start, end, cur_out_data,
+                QuantTensorFunctor<T>(static_cast<T>(bin_cnt), round_type,
+                                      inv_s));
         }
       }
     }
@@ -181,7 +176,7 @@ template <typename T>
 struct ChannelClipFakeQuantDequantFunctor<platform::CPUDeviceContext, T> {
   void operator()(const platform::CPUDeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, const int quant_axis,
+                  const int bin_cnt, const int round_type, const int quant_axis,
                   framework::Tensor* out) {
     PADDLE_ENFORCE_EQ(
         quant_axis == 0 || quant_axis == 1, true,
@@ -201,16 +196,13 @@ struct ChannelClipFakeQuantDequantFunctor<platform::CPUDeviceContext, T> {
         T s = scale_data[i];
         auto* start = in_data + i * channel_size;
         auto* end = in_data + (i + 1) * channel_size;
-        trans(ctx, start, end, out_data + i * channel_size,
-              phi::ClipFunctor<T>(-s, s));
-      }
-      for (int i = 0; i < channel; i++) {
-        T s = scale_data[i];
         T inv_s = inverse(s);
+        trans(
+            ctx, start, end, out_data + i * channel_size,
+            QuantTensorFunctor<T>(static_cast<T>(bin_cnt), round_type, inv_s));
         framework::Tensor one_channel_out = out->Slice(i, i + 1);
         auto out_e = framework::EigenVector<T>::Flatten(one_channel_out);
-        out_e.device(*ctx.eigen_device()) =
-            (bin_cnt * inv_s * out_e).round() * s / static_cast<T>(bin_cnt);
+        out_e.device(*ctx.eigen_device()) = out_e * s / static_cast<T>(bin_cnt);
       }
     } else if (quant_axis == 1) {
       const int64_t step_i = in.numel() / in_dims[0];
@@ -222,10 +214,11 @@ struct ChannelClipFakeQuantDequantFunctor<platform::CPUDeviceContext, T> {
           auto* start = in_data + i * step_i + j * step_j;
           auto* end = in_data + i * step_i + (j + 1) * step_j;
           auto* cur_out_data = out_data + i * step_i + j * step_j;
-          trans(ctx, start, end, cur_out_data, phi::ClipFunctor<T>(-s, s));
+          trans(ctx, start, end, cur_out_data,
+                QuantTensorFunctor<T>(static_cast<T>(bin_cnt), round_type,
+                                      inv_s));
           for (int k = 0; k < step_j; k++) {
-            cur_out_data[k] = std::round(bin_cnt * inv_s * cur_out_data[k]) *
-                              s / static_cast<T>(bin_cnt);
+            cur_out_data[k] = cur_out_data[k] * s / static_cast<T>(bin_cnt);
           }
         }
       }
@@ -334,6 +327,20 @@ class FakeQuantOrWithDequantAbsMaxOpMaker
                                 "the received is %d",
                                 bit_length));
         });
+    AddAttr<int>(
+        "round_type",
+        "(int, default 0) The round type of fp32 to int."
+        "0: rounding to nearest ties to even. Eg: round(1.5)=2, round(2.5)=2"
+        "1: rounding to nearest ties away from zero. Eg: round(1.5)=2, "
+        "round(2.5)=3")
+        .SetDefault(0)
+        .AddCustomChecker([](const int& round_type) {
+          PADDLE_ENFORCE_EQ(round_type >= 0 && round_type <= 1, true,
+                            platform::errors::InvalidArgument(
+                                "'round_type' should be between 0 and 1, but "
+                                "the received is %d",
+                                round_type));
+        });
     AddComment(R"DOC(
 This is a Base Op which supports FakeQuantAbsMaxOpMaker and FakeQuantDequantAbsMaxOpMaker.
 FakeQuantAbsMaxOp operator is used in the dynamic quantization.
@@ -407,6 +414,20 @@ class FakeChannelWiseQuantizeAbsMaxOpMaker
                                 "the received is %d",
                                 bit_length));
         });
+    AddAttr<int>(
+        "round_type",
+        "(int, default 0) The round type of fp32 to int."
+        "0: rounding to nearest ties to even. Eg: round(1.5)=2, round(2.5)=2"
+        "1: rounding to nearest ties away from zero. Eg: round(1.5)=2, "
+        "round(2.5)=3")
+        .SetDefault(0)
+        .AddCustomChecker([](const int& round_type) {
+          PADDLE_ENFORCE_EQ(round_type >= 0 && round_type <= 1, true,
+                            platform::errors::InvalidArgument(
+                                "'round_type' should be between 0 and 1, but "
+                                "the received is %d",
+                                round_type));
+        });
     AddAttr<bool>("is_test",
                   "(bool, default false) Set to true for inference only, false "
                   "for training. Some layers may run faster when this is true.")
@@ -480,6 +501,20 @@ class FakeChannelWiseQuantizeDequantizeAbsMaxOpMaker
                                 "the received is %d",
                                 bit_length));
         });
+    AddAttr<int>(
+        "round_type",
+        "(int, default 0) The round type of fp32 to int."
+        "0: rounding to nearest ties to even. Eg: round(1.5)=2, round(2.5)=2"
+        "1: rounding to nearest ties away from zero. Eg: round(1.5)=2, "
+        "round(2.5)=3")
+        .SetDefault(0)
+        .AddCustomChecker([](const int& round_type) {
+          PADDLE_ENFORCE_EQ(round_type >= 0 && round_type <= 1, true,
+                            platform::errors::InvalidArgument(
+                                "'round_type' should be between 0 and 1, but "
+                                "the received is %d",
+                                round_type));
+        });
     AddComment(R"DOC(
 The scale of FakeChannelWiseQuantize operator is a vector.
 In detail, each channel of the input X has a scale value.
@@ -546,6 +581,20 @@ class FakeQuantizeRangeAbsMaxOpMaker
                                 "the received is %d",
                                 bit_length));
         });
+    AddAttr<int>(
+        "round_type",
+        "(int, default 0) The round type of fp32 to int."
+        "0: rounding to nearest ties to even. Eg: round(1.5)=2, round(2.5)=2"
+        "1: rounding to nearest ties away from zero. Eg: round(1.5)=2, "
+        "round(2.5)=3")
+        .SetDefault(0)
+        .AddCustomChecker([](const int& round_type) {
+          PADDLE_ENFORCE_EQ(round_type >= 0 && round_type <= 1, true,
+                            platform::errors::InvalidArgument(
+                                "'round_type' should be between 0 and 1, but "
+                                "the received is %d",
+                                round_type));
+        });
     AddAttr<bool>("is_test",
                   "(bool, default false) Set to true for inference only, false "
                   "for training. Some layers may run faster when this is true.")
@@ -620,6 +669,20 @@ class FakeQuantOrWithDequantMovingAverageAbsMaxOpMaker
                                 "the received is %d",
                                 bit_length));
         });
+    AddAttr<int>(
+        "round_type",
+        "(int, default 0) The round type of fp32 to int."
+        "0: rounding to nearest ties to even. Eg: round(1.5)=2, round(2.5)=2"
+        "1: rounding to nearest ties away from zero. Eg: round(1.5)=2, "
+        "round(2.5)=3")
+        .SetDefault(0)
+        .AddCustomChecker([](const int& round_type) {
+          PADDLE_ENFORCE_EQ(round_type >= 0 && round_type <= 1, true,
+                            platform::errors::InvalidArgument(
+                                "'round_type' should be between 0 and 1, but "
+                                "the received is %d",
+                                round_type));
+        });
     AddAttr<bool>("is_test",
                   "(bool, default false) Set to true for inference only, false "
                   "for training. Some layers may run faster when this is true.")

paddle/fluid/operators/fake_quantize_op.cu.h

@@ -214,7 +214,8 @@ template struct FindChannelAbsMaxFunctor<platform::CUDADeviceContext, float>;
 
 template <typename T>
 __global__ void ClipAndQuantKernel(const T* in, const T* scale,
-                                   const int bin_cnt, const int n, T* out) {
+                                   const int bin_cnt, const int round_type,
+                                   const int n, T* out) {
   int bid = threadIdx.x + blockIdx.x * blockDim.x;
   int tid = threadIdx.x;
 
@@ -226,16 +227,24 @@ __global__ void ClipAndQuantKernel(const T* in, const T* scale,
 
   for (int i = bid; i < n; i += blockDim.x * gridDim.x) {
     ComputeDataType x = static_cast<ComputeDataType>(in[i]);
-    ComputeDataType v = x > s ? s : x;
-    v = v < -s ? -s : v;
-    v = bin_cnt_t * inv_s * v;
-    out[i] = static_cast<T>(round(v));
+    x = bin_cnt_t * inv_s * x;
+    if (round_type == 0) {
+      x = roundWithTiesToEven(x);
+    } else {
+      x = round(x);
+    }
+    ComputeDataType max_bound = bin_cnt_t;
+    ComputeDataType min_bound = -bin_cnt_t - static_cast<ComputeDataType>(1);
+    x = x > max_bound ? max_bound : x;
+    x = x < min_bound ? min_bound : x;
+    out[i] = static_cast<T>(x);
   }
 }
 
 template <typename T>
 __global__ void ClipAndQuantDequantKernel(const T* in, const T* scale,
-                                          const int bin_cnt, const int n,
+                                          const int bin_cnt,
+                                          const int round_type, const int n,
                                           T* out) {
   int bid = threadIdx.x + blockIdx.x * blockDim.x;
   int tid = threadIdx.x;
@@ -248,10 +257,16 @@ __global__ void ClipAndQuantDequantKernel(const T* in, const T* scale,
 
   for (int i = bid; i < n; i += blockDim.x * gridDim.x) {
     ComputeDataType x = static_cast<ComputeDataType>(in[i]);
-    x = x > s ? s : x;
-    x = x < -s ? -s : x;
     x = bin_cnt_t * inv_s * x;
+    if (round_type == 0) {
+      x = roundWithTiesToEven(x);
+    } else {
       x = round(x);
+    }
+    ComputeDataType max_bound = bin_cnt_t;
+    ComputeDataType min_bound = -bin_cnt_t - static_cast<ComputeDataType>(1);
+    x = x > max_bound ? max_bound : x;
+    x = x < min_bound ? min_bound : x;
     out[i] = static_cast<T>((x * s) / bin_cnt_t);
   }
 }
@@ -260,7 +275,8 @@ template <typename T>
 struct ClipAndFakeQuantFunctor<platform::CUDADeviceContext, T> {
   void operator()(const platform::CUDADeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, framework::Tensor* out) {
+                  const int bin_cnt, const int round_type,
+                  framework::Tensor* out) {
     int num = in.numel();
     int block = 1024;
     int grid = (block - 1 + num) / block;
@@ -270,7 +286,7 @@ struct ClipAndFakeQuantFunctor<platform::CUDADeviceContext, T> {
     T* out_data = out->mutable_data<T>(ctx.GetPlace());
 
     ClipAndQuantKernel<T><<<grid, block, 0, ctx.stream()>>>(
-        in_data, scale_data, bin_cnt, num, out_data);
+        in_data, scale_data, bin_cnt, round_type, num, out_data);
   }
 };
 
@@ -280,7 +296,8 @@ template <typename T>
 struct ClipAndFakeQuantDequantFunctor<platform::CUDADeviceContext, T> {
   void operator()(const platform::CUDADeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, framework::Tensor* out) {
+                  const int bin_cnt, const int round_type,
+                  framework::Tensor* out) {
     int num = in.numel();
     int block = 1024;
     int grid = (block - 1 + num) / block;
@@ -290,7 +307,7 @@ struct ClipAndFakeQuantDequantFunctor<platform::CUDADeviceContext, T> {
     T* out_data = out->mutable_data<T>(ctx.GetPlace());
 
     ClipAndQuantDequantKernel<T><<<grid, block, 0, ctx.stream()>>>(
-        in_data, scale_data, bin_cnt, num, out_data);
+        in_data, scale_data, bin_cnt, round_type, num, out_data);
   }
 };
 
@@ -298,6 +315,7 @@ struct ClipAndFakeQuantDequantFunctor<platform::CUDADeviceContext, T> {
 template <typename T>
 __global__ void ChannelClipAndQuantKernelQuantAxis0(const T* in, const T* scale,
                                                     const int bin_cnt,
+                                                    const int round_type,
                                                     const int64_t n,
                                                     const int c, T* out) {
   int tid = threadIdx.x;
@@ -314,18 +332,25 @@ __global__ void ChannelClipAndQuantKernelQuantAxis0(const T* in, const T* scale,
 
   for (int64_t i = tid; i < channel_size; i += blockDim.x) {
     ComputeDataType x = static_cast<ComputeDataType>(in_c[i]);
-    ComputeDataType v = x > s ? s : x;
-    v = v < -s ? -s : v;
-    v = bin_cnt_t * inv_s * v;
-    out_c[i] = static_cast<T>(round(v));
+    x = bin_cnt_t * inv_s * x;
+    if (round_type == 0) {
+      x = roundWithTiesToEven(x);
+    } else {
+      x = round(x);
+    }
+    ComputeDataType max_bound = bin_cnt_t;
+    ComputeDataType min_bound = -bin_cnt_t - static_cast<ComputeDataType>(1);
+    x = x > max_bound ? max_bound : x;
+    x = x < min_bound ? min_bound : x;
+    out_c[i] = static_cast<T>(x);
   }
 }
 
 // ChannelClipAndQuantKernel for quant_axis is N
 template <typename T>
 __global__ void ChannelClipAndQuantKernelQuantAxisN(
-    const T* in, const T* scale, const int bin_cnt, const int64_t n,
-    const int nScale, const int quant_stride, T* out) {
+    const T* in, const T* scale, const int bin_cnt, const int round_type,
+    const int64_t n, const int nScale, const int quant_stride, T* out) {
   int64_t idx = blockDim.x * blockIdx.x + threadIdx.x;
   using ComputeDataType = typename QuantizeDataType<T>::type;
   ComputeDataType bin_cnt_t = static_cast<ComputeDataType>(bin_cnt);
@@ -334,10 +359,17 @@ __global__ void ChannelClipAndQuantKernelQuantAxisN(
         static_cast<ComputeDataType>(scale[(i / quant_stride) % nScale]);
     ComputeDataType inv_s = inverse(s);
     ComputeDataType x = static_cast<ComputeDataType>(in[i]);
-    ComputeDataType v = x > s ? s : x;
-    v = v < -s ? -s : v;
-    v = bin_cnt_t * inv_s * v;
-    out[i] = static_cast<T>(round(v));
+    x = bin_cnt_t * inv_s * x;
+    if (round_type == 0) {
+      x = roundWithTiesToEven(x);
+    } else {
+      x = round(x);
+    }
+    ComputeDataType max_bound = bin_cnt_t;
+    ComputeDataType min_bound = -bin_cnt_t - static_cast<ComputeDataType>(1);
+    x = x > max_bound ? max_bound : x;
+    x = x < min_bound ? min_bound : x;
+    out[i] = static_cast<T>(x);
   }
 }
 
@@ -345,7 +377,7 @@ template <typename T>
 struct ChannelClipAndFakeQuantFunctor<platform::CUDADeviceContext, T> {
   void operator()(const platform::CUDADeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, const int quant_axis,
+                  const int bin_cnt, const int round_type, const int quant_axis,
                   framework::Tensor* out) {
     PADDLE_ENFORCE_EQ(
         quant_axis == 0 || quant_axis == 1, true,
@@ -363,7 +395,7 @@ struct ChannelClipAndFakeQuantFunctor<platform::CUDADeviceContext, T> {
       int grid = in_dims[0];
       int block = 1024;
       ChannelClipAndQuantKernelQuantAxis0<T><<<grid, block, 0, ctx.stream()>>>(
-          in_data, scale_data, bin_cnt, num, in_dims[0], out_data);
+          in_data, scale_data, bin_cnt, round_type, num, in_dims[0], out_data);
     } else {
       int quant_stride = 1;
       for (int i = quant_axis + 1; i < in_dims.size(); i++) {
@@ -380,8 +412,8 @@ struct ChannelClipAndFakeQuantFunctor<platform::CUDADeviceContext, T> {
           std::min(max_blocks, (num + block_size - 1) / block_size);
 
       ChannelClipAndQuantKernelQuantAxisN<T><<<grid_size, block_size>>>(
-          in_data, scale_data, bin_cnt, num, in_dims[quant_axis], quant_stride,
-          out_data);
+          in_data, scale_data, bin_cnt, round_type, num, in_dims[quant_axis],
+          quant_stride, out_data);
     }
   }
 };
@@ -485,8 +517,8 @@ struct FindMovingAverageAbsMaxFunctor<platform::CUDADeviceContext, T> {
 // ChannelClipAndQuantDequantKernel for quant_axis is 0
 template <typename T>
 __global__ void ChannelClipAndQuantDequantKernelQuantAxis0(
-    const T* in, const T* scale, const int bin_cnt, const int n, const int c,
-    T* out) {
+    const T* in, const T* scale, const int bin_cnt, const int round_type,
+    const int n, const int c, T* out) {
   int tid = threadIdx.x;
 
   int channel_size = n / c;
@@ -498,18 +530,25 @@ __global__ void ChannelClipAndQuantDequantKernelQuantAxis0(
 
   for (int i = tid; i < channel_size; i += blockDim.x) {
     T x = in_c[i];
-    T v = x > s ? s : x;
-    v = v < -s ? -s : v;
-    v = bin_cnt * inv_s * v;
-    out_c[i] = round(v) * s / bin_cnt;
+    x = bin_cnt * inv_s * x;
+    if (round_type == 0) {
+      x = roundWithTiesToEven(x);
+    } else {
+      x = round(x);
+    }
+    T max_bound = bin_cnt;
+    T min_bound = -bin_cnt - static_cast<T>(1);
+    x = x > max_bound ? max_bound : x;
+    x = x < min_bound ? min_bound : x;
+    out_c[i] = (x * s) / bin_cnt;
   }
 }
 
 // ChannelClipAndQuantDequantKernel for quant_axis is 1
 template <typename T>
 __global__ void ChannelClipAndQuantDequantKernelQuantAxis1(
-    const T* in, const T* scale, const int bin_cnt, const int n, const int cin,
-    const int cout, T* out) {
+    const T* in, const T* scale, const int bin_cnt, const int round_type,
+    const int n, const int cin, const int cout, T* out) {
   T s = scale[blockIdx.x % cout];
   T inv_s = inverse(s);
 
@@ -519,10 +558,17 @@ __global__ void ChannelClipAndQuantDequantKernelQuantAxis1(
 
   for (int i = threadIdx.x; i < wh_size; i += blockDim.x) {
     T x = in_c[i];
-    T v = x > s ? s : x;
-    v = v < -s ? -s : v;
-    v = bin_cnt * inv_s * v;
-    out_c[i] = round(v) * s / bin_cnt;
+    x = bin_cnt * inv_s * x;
+    if (round_type == 0) {
+      x = roundWithTiesToEven(x);
+    } else {
+      x = round(x);
+    }
+    T max_bound = bin_cnt;
+    T min_bound = -bin_cnt - static_cast<T>(1);
+    x = x > max_bound ? max_bound : x;
+    x = x < min_bound ? min_bound : x;
+    out_c[i] = (x * s) / bin_cnt;
   }
 }
 
@@ -530,7 +576,7 @@ template <typename T>
 struct ChannelClipFakeQuantDequantFunctor<platform::CUDADeviceContext, T> {
   void operator()(const platform::CUDADeviceContext& ctx,
                   const framework::Tensor& in, const framework::Tensor& scale,
-                  const int bin_cnt, const int quant_axis,
+                  const int bin_cnt, const int round_type, const int quant_axis,
                   framework::Tensor* out) {
     // At present, channelwise quantization supports conv2d, depthwise_conv2d
     // conv2d_transpose and mul
@@ -551,15 +597,17 @@ struct ChannelClipFakeQuantDequantFunctor<platform::CUDADeviceContext, T> {
       int grid = in_dims[0];
       int block = 1024;
       ChannelClipAndQuantDequantKernelQuantAxis0<T>
-          <<<grid, block, 0, ctx.stream()>>>(in_data, scale_data, bin_cnt, num,
-                                             in_dims[0], out_data);
+          <<<grid, block, 0, ctx.stream()>>>(in_data, scale_data, bin_cnt,
+                                             round_type, num, in_dims[0],
+                                             out_data);
     } else if (quant_axis == 1) {
       int grid = in_dims[0] * in_dims[1];
       int block = 1024;
 
       ChannelClipAndQuantDequantKernelQuantAxis1<T>
-          <<<grid, block, 0, ctx.stream()>>>(in_data, scale_data, bin_cnt, num,
-                                             in_dims[0], in_dims[1], out_data);
+          <<<grid, block, 0, ctx.stream()>>>(in_data, scale_data, bin_cnt,
+                                             round_type, num, in_dims[0],
+                                             in_dims[1], out_data);
     }
   }
 };

paddle/fluid/operators/fake_quantize_op.h

@@ -34,6 +34,46 @@ inline HOSTDEVICE T inverse(T s) {
   return s <= static_cast<T>(1e-30) ? one / (s + eps) : one / s;
 }
 
+template <typename T>
+inline HOSTDEVICE T roundWithTiesToEven(T x) {
+  T xLower = floor(x);
+  T xUpper = ceil(x);
+  // x is in interval [xl,xu]. Choose closest of two bounds, breaking ties to
+  // even.
+  T dLower = x - xLower;
+  T dUpper = xUpper - x;
+  return static_cast<T>(
+      (dLower == dUpper ? fmod(xLower, 2.0F) == 0.0F : dLower < dUpper)
+          ? xLower
+          : xUpper);
+}
+
+template <typename T>
+class QuantTensorFunctor {
+ public:
+  explicit QuantTensorFunctor(const T bin_cnt, const int round_type,
+                              const T inv_s)
+      : bin_cnt_(bin_cnt), round_type_(round_type), inv_s_(inv_s) {}
+  HOSTDEVICE T operator()(const T x) const {
+    T out = bin_cnt_ * inv_s_ * x;
+    if (round_type_ == 0) {
+      out = roundWithTiesToEven(out);
+    } else if (round_type_ == 1) {
+      out = std::round(out);
+    }
+    T max_bound = bin_cnt_;
+    T min_bound = -bin_cnt_ - static_cast<T>(1);
+    out = out > max_bound ? max_bound : out;
+    out = out < min_bound ? min_bound : out;
+    return out;
+  }
+
+ private:
+  T bin_cnt_;
+  int round_type_;
+  T inv_s_;
+};
+
 template <typename DeviceContext, typename T>
 struct FindAbsMaxFunctor {
   void operator()(const DeviceContext& ctx, const T* in, const int num, T* out);
@@ -43,14 +83,14 @@ template <typename DeviceContext, typename T>
 struct ClipAndFakeQuantFunctor {
   void operator()(const DeviceContext& ctx, const framework::Tensor& in,
                   const framework::Tensor& scale, const int bin_cnt,
-                  framework::Tensor* out);
+                  const int round_type, framework::Tensor* out);
 };
 
 template <typename DeviceContext, typename T>
 struct ClipAndFakeQuantDequantFunctor {
   void operator()(const DeviceContext& ctx, const framework::Tensor& in,
                   const framework::Tensor& scale, const int bin_cnt,
-                  framework::Tensor* out);
+                  int round_type, framework::Tensor* out);
 };
 
 template <typename DeviceContext, typename T>
@@ -71,14 +111,15 @@ template <typename DeviceContext, typename T>
 struct ChannelClipAndFakeQuantFunctor {
   void operator()(const DeviceContext& ctx, const framework::Tensor& in,
                   const framework::Tensor& scale, const int bin_cnt,
-                  const int quant_axis, framework::Tensor* out);
+                  const int round_type, const int quant_axis,
+                  framework::Tensor* out);
 };
 
 template <typename DeviceContext, typename T>
 struct ChannelClipFakeQuantDequantFunctor {
   void operator()(const DeviceContext& ctx, const framework::Tensor& in,
                   const framework::Tensor& scale, const int bin_cnt,
-                  const int quant_axis, framework::Tensor* out);
+                  int round_type, const int quant_axis, framework::Tensor* out);
 };
 
 template <typename DeviceContext, typename T>
@@ -100,12 +141,13 @@ class FakeAbsMaxKernelBase : public framework::OpKernel<T> {
     T* out_s = out_scale->mutable_data<T>(context.GetPlace());
 
     int bit_length = context.Attr<int>("bit_length");
+    int round_type = context.Attr<int>("round_type");
     int bin_cnt = std::pow(2, bit_length - 1) - 1;
 
     auto& dev_ctx = context.template device_context<DeviceContext>();
     const T* in_data = in->data<T>();
     FindAbsMaxFunctor<DeviceContext, T>()(dev_ctx, in_data, in->numel(), out_s);
-    RunClipFunctor(dev_ctx, *in, *out_scale, bin_cnt, out);
+    RunClipFunctor(dev_ctx, *in, *out_scale, bin_cnt, round_type, out);
   }
 
   virtual ~FakeAbsMaxKernelBase() = default;
@@ -114,7 +156,7 @@ class FakeAbsMaxKernelBase : public framework::OpKernel<T> {
   virtual void RunClipFunctor(const DeviceContext& dev_ctx,
                               const framework::Tensor& in,
                               const framework::Tensor& scale, int bin_cnt,
-                              framework::Tensor* out) const = 0;
+                              int round_type, framework::Tensor* out) const = 0;
 };
 
 template <typename DeviceContext, typename T>
@@ -122,9 +164,9 @@ class FakeQuantizeAbsMaxKernel : public FakeAbsMaxKernelBase<DeviceContext, T> {
  protected:
   void RunClipFunctor(const DeviceContext& dev_ctx, const framework::Tensor& in,
                       const framework::Tensor& scale, int bin_cnt,
-                      framework::Tensor* out) const override {
+                      int round_type, framework::Tensor* out) const override {
     ClipAndFakeQuantFunctor<DeviceContext, T>()(dev_ctx, in, scale, bin_cnt,
-                                                out);
+                                                round_type, out);
   }
 };
 
@@ -134,9 +176,9 @@ class FakeQuantizeDequantizeAbsMaxKernel
  protected:
   void RunClipFunctor(const DeviceContext& dev_ctx, const framework::Tensor& in,
                       const framework::Tensor& scale, int bin_cnt,
-                      framework::Tensor* out) const override {
-    ClipAndFakeQuantDequantFunctor<DeviceContext, T>()(dev_ctx, in, scale,
-                                                       bin_cnt, out);
+                      int round_type, framework::Tensor* out) const override {
+    ClipAndFakeQuantDequantFunctor<DeviceContext, T>()(
+        dev_ctx, in, scale, bin_cnt, round_type, out);
   }
 };
 
@@ -151,6 +193,7 @@ class FakeChannelWiseQuantizeAbsMaxKernel : public framework::OpKernel<T> {
     out->mutable_data<T>(context.GetPlace());
 
     int bit_length = context.Attr<int>("bit_length");
+    int round_type = context.Attr<int>("round_type");
     int bin_cnt = std::pow(2, bit_length - 1) - 1;
     int quant_axis = context.Attr<int>("quant_axis");
     bool is_test = context.Attr<bool>("is_test");
@@ -162,7 +205,7 @@ class FakeChannelWiseQuantizeAbsMaxKernel : public framework::OpKernel<T> {
                                                    out_scale_data);
     }
     ChannelClipAndFakeQuantFunctor<DeviceContext, T>()(
-        dev_ctx, *in, *out_scale, bin_cnt, quant_axis, out);
+        dev_ctx, *in, *out_scale, bin_cnt, round_type, quant_axis, out);
   }
 };
 
@@ -179,6 +222,7 @@ class FakeChannelWiseQuantizeDequantizeAbsMaxKernel
     out->mutable_data<T>(dev_ctx.GetPlace());
 
     int bit_length = context.Attr<int>("bit_length");
+    int round_type = context.Attr<int>("round_type");
     int bin_cnt = std::pow(2, bit_length - 1) - 1;
     int quant_axis = context.Attr<int>("quant_axis");
 
@@ -186,7 +230,7 @@ class FakeChannelWiseQuantizeDequantizeAbsMaxKernel
                                                  out_scale_data);
 
     ChannelClipFakeQuantDequantFunctor<DeviceContext, T>()(
-        dev_ctx, *in, *out_scale, bin_cnt, quant_axis, out);
+        dev_ctx, *in, *out_scale, bin_cnt, round_type, quant_axis, out);
   }
 };
 
@@ -202,13 +246,14 @@ class FakeQuantizeRangeAbsMaxKernel : public framework::OpKernel<T> {
 
     bool is_test = context.Attr<bool>("is_test");
     int bit_length = context.Attr<int>("bit_length");
+    int round_type = context.Attr<int>("round_type");
     int bin_cnt = std::pow(2, bit_length - 1) - 1;
     auto& dev_ctx = context.template device_context<DeviceContext>();
 
     // testing
     if (is_test) {
       ClipAndFakeQuantFunctor<DeviceContext, T>()(dev_ctx, *in, *in_scale,
-                                                  bin_cnt, out);
+                                                  bin_cnt, round_type, out);
       return;
     }
 
@@ -228,7 +273,7 @@ class FakeQuantizeRangeAbsMaxKernel : public framework::OpKernel<T> {
                                                *iter, window_size, out_scales,
                                                out_scale);
     ClipAndFakeQuantFunctor<DeviceContext, T>()(dev_ctx, *in, *out_scale,
-                                                bin_cnt, out);
+                                                bin_cnt, round_type, out);
   }
 };
 
@@ -243,12 +288,13 @@ class FakeMovingAverageAbsMaxKernelBase : public framework::OpKernel<T> {
 
     bool is_test = context.Attr<bool>("is_test");
     int bit_length = context.Attr<int>("bit_length");
+    int round_type = context.Attr<int>("round_type");
     int bin_cnt = std::pow(2, bit_length - 1) - 1;
     auto& dev_ctx = context.template device_context<DeviceContext>();
 
     // testing
     if (is_test) {
-      RunClipFunctor(dev_ctx, *in, *in_scale, bin_cnt, out);
+      RunClipFunctor(dev_ctx, *in, *in_scale, bin_cnt, round_type, out);
       return;
     }
 
@@ -273,7 +319,7 @@ class FakeMovingAverageAbsMaxKernelBase : public framework::OpKernel<T> {
         dev_ctx, *in_accum, *in_state, cur_scale_data, moving_rate, out_state,
         out_accum, out_scale);
 
-    RunClipFunctor(dev_ctx, *in, *out_scale, bin_cnt, out);
+    RunClipFunctor(dev_ctx, *in, *out_scale, bin_cnt, round_type, out);
   }
 
   virtual ~FakeMovingAverageAbsMaxKernelBase() = default;
@@ -282,7 +328,7 @@ class FakeMovingAverageAbsMaxKernelBase : public framework::OpKernel<T> {
   virtual void RunClipFunctor(const DeviceContext& dev_ctx,
                               const framework::Tensor& in,
                               const framework::Tensor& in_scale, int bin_cnt,
-                              framework::Tensor* out) const = 0;
+                              int round_type, framework::Tensor* out) const = 0;
 };
 
 template <typename DeviceContext, typename T>
@@ -291,9 +337,9 @@ class FakeQuantizeMovingAverageAbsMaxKernel
  protected:
   void RunClipFunctor(const DeviceContext& dev_ctx, const framework::Tensor& in,
                       const framework::Tensor& in_scale, int bin_cnt,
-                      framework::Tensor* out) const override {
+                      int round_type, framework::Tensor* out) const override {
     ClipAndFakeQuantFunctor<DeviceContext, T>()(dev_ctx, in, in_scale, bin_cnt,
-                                                out);
+                                                round_type, out);
   }
 };
 
@@ -303,9 +349,9 @@ class FakeQuantizeDequantizeMovingAverageAbsMaxKernel
  protected:
   void RunClipFunctor(const DeviceContext& dev_ctx, const framework::Tensor& in,
                       const framework::Tensor& in_scale, int bin_cnt,
-                      framework::Tensor* out) const override {
-    ClipAndFakeQuantDequantFunctor<DeviceContext, T>()(dev_ctx, in, in_scale,
-                                                       bin_cnt, out);
+                      int round_type, framework::Tensor* out) const override {
+    ClipAndFakeQuantDequantFunctor<DeviceContext, T>()(
+        dev_ctx, in, in_scale, bin_cnt, round_type, out);
   }
 };
 

paddle/fluid/operators/quantize_linear_op.cc

@@ -69,8 +69,6 @@ struct ChannelDequantizeFunctorV2<platform::CPUDeviceContext, T> {
   }
 };
 
-template struct DequantizeFunctor<platform::CPUDeviceContext, float>;
-template struct DequantizeFunctor<platform::CPUDeviceContext, double>;
 template struct ChannelDequantizeFunctorV2<platform::CPUDeviceContext, float>;
 template struct ChannelDequantizeFunctorV2<platform::CPUDeviceContext, double>;
 
@@ -135,6 +133,20 @@ class QuantizeLinearOpMaker : public framework::OpProtoAndCheckerMaker {
                                 "the received is %d",
                                 bit_length));
         });
+    AddAttr<int>(
+        "round_type",
+        "(int, default 0) The round type of fp32 to int."
+        "0: rounding to nearest ties to even. Eg: round(1.5)=2, round(2.5)=2"
+        "1: rounding to nearest ties away from zero. Eg: round(1.5)=2, "
+        "round(2.5)=3")
+        .SetDefault(0)
+        .AddCustomChecker([](const int& round_type) {
+          PADDLE_ENFORCE_EQ(round_type >= 0 && round_type <= 1, true,
+                            platform::errors::InvalidArgument(
+                                "'round_type' should be between 0 and 1, but "
+                                "the received is %d",
+                                round_type));
+        });
     AddAttr<bool>("is_test",
                   "(bool, default false) Set to true for inference only, false "
                   "for training. Some layers may run faster when this is true.")

paddle/fluid/operators/quantize_linear_op.h

@@ -45,6 +45,7 @@ class QuantizeLinearKernel : public framework::OpKernel<T> {
     auto* out = context.Output<framework::Tensor>("Y");
     out->mutable_data<T>(context.GetPlace());
     int bit_length = context.Attr<int>("bit_length");
+    int round_type = context.Attr<int>("round_type");
     int bin_cnt = std::pow(2, bit_length - 1) - 1;
     int quant_axis = context.Attr<int>("quant_axis");
     bool is_test = context.Attr<bool>("is_test");
@@ -57,10 +58,10 @@ class QuantizeLinearKernel : public framework::OpKernel<T> {
         FindAbsMaxFunctor<DeviceContext, T>()(dev_ctx, in->data<T>(),
                                               in->numel(), out_s);
         ClipAndFakeQuantFunctor<DeviceContext, T>()(dev_ctx, *in, *out_scale,
-                                                    bin_cnt, out);
+                                                    bin_cnt, round_type, out);
       } else {
         ClipAndFakeQuantFunctor<DeviceContext, T>()(dev_ctx, *in, *in_scale,
-                                                    bin_cnt, out);
+                                                    bin_cnt, round_type, out);
       }
     } else {
       if (!is_test) {
@@ -69,10 +70,10 @@ class QuantizeLinearKernel : public framework::OpKernel<T> {
         FindChannelAbsMaxFunctor<DeviceContext, T>()(dev_ctx, *in, quant_axis,
                                                      out_scale_data);
         ChannelClipAndFakeQuantFunctor<DeviceContext, T>()(
-            dev_ctx, *in, *out_scale, bin_cnt, quant_axis, out);
+            dev_ctx, *in, *out_scale, bin_cnt, round_type, quant_axis, out);
       } else {
         ChannelClipAndFakeQuantFunctor<DeviceContext, T>()(
-            dev_ctx, *in, *in_scale, bin_cnt, quant_axis, out);
+            dev_ctx, *in, *in_scale, bin_cnt, round_type, quant_axis, out);
       }
     }
   }

python/paddle/fluid/contrib/slim/quantization/adaround.py

@@ -20,7 +20,7 @@ import logging
 import paddle.fluid as fluid
 
 from ....log_helper import get_logger
-from .utils import load_variable_data, set_variable_data, stable_sigmoid, quant_tensor, dequant_tensor, _channelwise_quant_axis1_ops, calculate_quant_cos_error
+from .utils import load_variable_data, set_variable_data, stable_sigmoid, quant_tensor, dequant_tensor, _channelwise_quant_axis1_ops, calculate_quant_cos_error, bias_correction_w
 
 _logger = get_logger(__name__,
                      logging.INFO,
@@ -209,6 +209,7 @@ def run_adaround(data_loader,
                  scale_dict,
                  num_iterations=1000,
                  lr=0.001,
+                 bias_correction=False,
                  fast_mode=True):
     fetch_op_name = fetch_list[0].name
     final_weight_tensor_quant_dict = {}
@@ -307,6 +308,15 @@ def run_adaround(data_loader,
                 break
         final_weight_tensor_quant_dict[
             weight_var_name] = adaround.update_final_weights()
+
+        if bias_correction:
+            final_weight_tensor_quant_dict[weight_var_name] = bias_correction_w(
+                weight_var_tensor,
+                final_weight_tensor_quant_dict[weight_var_name],
+                scale,
+                adaround.quant_axis,
+                weight_bits=adaround.weight_bits)
+
         del adaround
 
     # update adarounded calibrated weights

python/paddle/fluid/contrib/slim/quantization/post_training_quantization.py

@@ -121,7 +121,8 @@ class PostTrainingQuantization(object):
                  algo="KL",
                  hist_percent=0.99999,
                  quantizable_op_type=["conv2d", "depthwise_conv2d", "mul"],
-                 round_type='round',
+                 weight_round_algo='round',
+                 round_type='TiesToEven',
                  learning_rate=0.001,
                  is_full_quantize=False,
                  bias_correction=False,
@@ -180,9 +181,14 @@ class PostTrainingQuantization(object):
             quantizable_op_type(list[str], optional): List the type of ops 
                 that will be quantized. Default is ["conv2d", "depthwise_conv2d", 
                 "mul"].
-            round_type(str, optional): The method of converting the quantized weights
+            weight_round_algo(str, optional): The method of converting the quantized weights
                 value float->int. Currently supports ['round', 'adaround'] methods.
-                Default is `round`, which is rounding nearest to the nearest whole number.
+                Default is `round`, which is rounding nearest to the integer.
+                'adaround' is refer to https://arxiv.org/abs/2004.10568.
+            round_type(str, optional): The method of converting the tensor value float->int.
+                Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+                Default is `TiesToEven`, which is rounding to nearest ties to even. 
+                'TiesAwayFromZero' is rounding to nearest ties away from zero.
             learning_rate(float, optional): The learning rate of adaround method.
             is_full_quantized(bool, optional): If set is_full_quantized as True, 
                 apply quantization to all supported quantizable op type. If set
@@ -263,8 +269,10 @@ class PostTrainingQuantization(object):
         self._support_algo_type = [
             'KL', 'hist', 'avg', 'mse', 'emd', 'abs_max', 'min_max'
         ]
-        assert round_type in ['adaround', 'round']
+        assert round_type in ['TiesToEven', 'TiesAwayFromZero']
         self._round_type = round_type
+        assert weight_round_algo in ['adaround', 'round']
+        self._weight_round_algo = weight_round_algo
         self._learning_rate = learning_rate
         self._dynamic_quantize_op_type = ['lstm']
         self._support_quantize_op_type = \
@@ -406,7 +414,7 @@ class PostTrainingQuantization(object):
         if self._algo in ["KL", "hist"]:
             self._calculate_kl_hist_threshold()
 
-        if self._round_type == 'adaround':
+        if self._weight_round_algo == 'adaround':
             self._adaround_apply()
 
         self._reset_activation_persistable()
@@ -459,6 +467,7 @@ class PostTrainingQuantization(object):
                      self._weight_op_pairs,
                      scale_dict,
                      num_iterations=self._batch_nums,
+                     bias_correction=self._bias_correction,
                      lr=self._learning_rate)
 
     def save_quantized_model(self,
@@ -642,6 +651,7 @@ class PostTrainingQuantization(object):
                                 float(np.max(np.abs(var_tensor[i]))))
                 self._quantized_threshold[var_name] = abs_max_value
         _logger.info("MSE searching stage ...")
+        distribution = np.round if self._round_type == 'TiesToEven' else utils.round_c
         for var_name in self._quantized_act_var_name:
             var_tensor = utils.load_variable_data(self._scope, var_name)
             var_tensor = var_tensor.flatten()
@@ -654,9 +664,9 @@ class PostTrainingQuantization(object):
                 scale = s * abs_max_value
                 s += 0.02
                 bins = 2**(self._activation_bits - 1) - 1
-                quant_dequant_var = np.round(
-                    np.clip(var_tensor, 0.0, scale) / scale *
-                    bins) / bins * scale
+                quant_var = np.clip(distribution(var_tensor / scale * bins),
+                                    -bins - 1, bins)
+                quant_dequant_var = quant_var / bins * scale
                 mse_loss = ((var_tensor - quant_dequant_var)**2).mean()
                 if mse_loss <= self._best_calibration_loss[var_name]:
                     self._best_calibration_loss[var_name] = mse_loss
@@ -681,6 +691,7 @@ class PostTrainingQuantization(object):
                                 float(np.max(np.abs(var_tensor[i]))))
                 self._quantized_threshold[var_name] = abs_max_value
         _logger.info("EMD searching stage ...")
+        distribution = np.round if self._round_type == 'TiesToEven' else utils.round_c
         for var_name in self._quantized_act_var_name:
             var_tensor = utils.load_variable_data(self._scope, var_name)
             var_tensor = var_tensor.flatten()
@@ -693,9 +704,9 @@ class PostTrainingQuantization(object):
                 scale = s * abs_max_value
                 s += 0.02
                 bins = 2**(self._activation_bits - 1) - 1
-                quant_dequant_var = np.round(
-                    np.clip(var_tensor, 0.0, scale) / scale *
-                    bins) / bins * scale
+                quant_var = np.clip(distribution(var_tensor / scale * bins),
+                                    -bins - 1, bins)
+                quant_dequant_var = quant_var / bins * scale
                 emd_loss = np.abs(
                     np.mean(var_tensor) - np.mean(quant_dequant_var)) + np.abs(
                         np.std(var_tensor) - np.std(quant_dequant_var))
@@ -907,7 +918,8 @@ class PostTrainingQuantization(object):
                 activation_bits=self._activation_bits,
                 activation_quantize_type=self._activation_quantize_type,
                 weight_quantize_type=self._weight_quantize_type,
-                quantizable_op_type=major_quantizable_op_types)
+                quantizable_op_type=major_quantizable_op_types,
+                round_type=self._round_type)
         else:
             transform_pass = QuantizationTransformPassV2(
                 scope=self._scope,
@@ -916,7 +928,8 @@ class PostTrainingQuantization(object):
                 activation_bits=self._activation_bits,
                 activation_quantize_type=self._activation_quantize_type,
                 weight_quantize_type=self._weight_quantize_type,
-                quantizable_op_type=major_quantizable_op_types)
+                quantizable_op_type=major_quantizable_op_types,
+                round_type=self._round_type)
 
         for sub_graph in graph.all_sub_graphs():
             # Insert fake_quant/fake_dequantize op must in test graph, so
@@ -933,13 +946,15 @@ class PostTrainingQuantization(object):
             add_quant_dequant_pass = AddQuantDequantPass(
                 scope=self._scope,
                 place=self._place,
-                quantizable_op_type=minor_quantizable_op_types)
+                quantizable_op_type=minor_quantizable_op_types,
+                round_type=self._round_type)
         else:
             add_quant_dequant_pass = AddQuantDequantPassV2(
                 scope=self._scope,
                 place=self._place,
                 quantizable_op_type=minor_quantizable_op_types,
-                is_full_quantized=self._is_full_quantize)
+                is_full_quantized=self._is_full_quantize,
+                round_type=self._round_type)
 
         for sub_graph in graph.all_sub_graphs():
             sub_graph._for_test = True
@@ -964,6 +979,7 @@ class PostTrainingQuantization(object):
                 place=self._place,
                 bias_correction=self._bias_correction,
                 weight_bits=self._weight_bits,
+                weight_round_algo=self._weight_round_algo,
                 round_type=self._round_type,
                 activation_bits=self._activation_bits,
                 weight_quantize_type=self._weight_quantize_type,

python/paddle/fluid/contrib/slim/quantization/quantization_pass.py

@@ -119,6 +119,7 @@ class QuantizationTransformPass(object):
                  moving_rate=0.9,
                  skip_pattern=['skip_quant'],
                  quantizable_op_type=['conv2d', 'depthwise_conv2d', 'mul'],
+                 round_type='TiesToEven',
                  weight_quantize_func=None,
                  act_quantize_func=None,
                  weight_preprocess_func=None,
@@ -156,6 +157,10 @@ class QuantizationTransformPass(object):
             quantizable_op_type(list[str]): List the type of ops that will be quantized. 
                 Default is ["conv2d", "depthwise_conv2d", "mul"]. The quantizable_op_type in
                 QuantizationFreezePass and ConvertToInt8Pass must be the same as this.
+            round_type(str, optional): The method of converting the tensor value float->int.
+                Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+                Default is `TiesToEven`, which is rounding to nearest ties to even. 
+                'TiesAwayFromZero' is rounding to nearest ties away from zero.
             weight_quantize_func(function): Function that defines how to quantize weight.
                 Using this can quickly test if user's quantization method works or not.
                 In this function, user should both define quantization function and
@@ -206,6 +211,7 @@ class QuantizationTransformPass(object):
         self._weight_bits = weight_bits
         self._activation_bits = activation_bits
         self._skip_pattern = skip_pattern
+        self._round_type = round_type
         self._weight_quantize_func = weight_quantize_func
         self._act_quantize_func = act_quantize_func
         self._weight_preprocess_func = weight_preprocess_func
@@ -459,10 +465,12 @@ class QuantizationTransformPass(object):
         _init_var_node(scale_var_node,
                        np.zeros(scale_var_node.shape(), dtype=data_type),
                        self._scope, self._place)
+        round_type = 0 if self._round_type == 'TiesToEven' else 1
         quant_op_node = graph.create_op_node(
             op_type='fake_quantize_abs_max',
             attrs={
                 'bit_length': quant_bits,
+                'round_type': round_type,
                 'op_role': core.op_proto_and_checker_maker.OpRole.Forward
             },
             inputs={'X': var_node},
@@ -517,9 +525,11 @@ class QuantizationTransformPass(object):
 
             inputs['Iter'] = self._global_step
             outputs['OutScales'] = scales_node
+        round_type = 0 if self._round_type == 'TiesToEven' else 1
         attrs = {
             'window_size': self._window_size,
             'bit_length': quant_bits,
+            'round_type': round_type,
             'is_test': self._is_test,
             'op_role': core.op_proto_and_checker_maker.OpRole.Forward
         }
@@ -590,8 +600,10 @@ class QuantizationTransformPass(object):
             outs['OutState'] = state_out_node
             outs['OutAccum'] = accum_out_node
 
+        round_type = 0 if self._round_type == 'TiesToEven' else 1
         attrs = {
             'bit_length': quant_bits,
+            'round_type': round_type,
             'moving_rate': self._moving_rate,
             'is_test': self._is_test,
             'op_role': core.op_proto_and_checker_maker.OpRole.Forward
@@ -638,10 +650,12 @@ class QuantizationTransformPass(object):
         _init_var_node(scale_var_node,
                        np.zeros(scale_var_node.shape(), dtype=data_type),
                        self._scope, self._place)
+        round_type = 0 if self._round_type == 'TiesToEven' else 1
         quant_op_node = graph.create_op_node(
             op_type='fake_channel_wise_quantize_abs_max',
             attrs={
                 'bit_length': quant_bits,
+                'round_type': round_type,
                 'quant_axis': quant_axis,
                 'is_test': self._is_test,
                 'op_role': core.op_proto_and_checker_maker.OpRole.Forward
@@ -935,7 +949,8 @@ class QuantizationFreezePass(object):
                  bias_correction=False,
                  weight_bits=8,
                  activation_bits=8,
-                 round_type='round',
+                 weight_round_algo='round',
+                 round_type='TiesToEven',
                  weight_quantize_type='abs_max',
                  quantizable_op_type=None):
         """
@@ -953,9 +968,14 @@ class QuantizationFreezePass(object):
                  https://arxiv.org/abs/1810.05723.
             weight_bits(int): quantization bit number for weights.
             activation_bits(int): quantization bit number for activation.
-            round_type(str, optional): The method of converting the quantized weights
-                value from float to int. Currently supports ['round', 'adaround'] methods.
-                Default is `round`, which is rounding nearest to the nearest whole number. 
+            weight_round_algo(str, optional): The method of converting the quantized weights
+                value float->int. Currently supports ['round', 'adaround'] methods.
+                Default is `round`, which is rounding nearest to the integer.
+                'adaround' is refer to https://arxiv.org/abs/2004.10568.
+            round_type(str, optional): The method of converting the tensor value float->int.
+                Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+                Default is `TiesToEven`, which is rounding to nearest ties to even. 
+                'TiesAwayFromZero' is rounding to nearest ties away from zero.
             weight_quantize_type(str): quantization type for weights, support 'abs_max' and 
                 'channel_wise_abs_max'. The 'range_abs_max' usually is not used for weight, 
                 since weights are fixed once the model is well trained.
@@ -971,6 +991,7 @@ class QuantizationFreezePass(object):
         self._place = _get_paddle_place(place)
         self._weight_bits = weight_bits
         self._activation_bits = activation_bits
+        self._weight_round_algo = weight_round_algo
         self._round_type = round_type
         self._weight_quantize_type = weight_quantize_type
         self._fake_quant_op_names = _fake_quant_op_list
@@ -1018,8 +1039,8 @@ class QuantizationFreezePass(object):
                         scale_v = scale_v.tolist()
                     self._quant_var_scale_map[input_arg_name] = scale_v
                     # Quantize weight and restore
+                    if self._weight_round_algo == 'round':
                         param_v = self._load_var(input_arg_name)
-                    if self._round_type == 'round':
                         if any(
                                 _check_grandchild_op_node(op_node, op)
                                 for op in utils._channelwise_quant_axis1_ops):
@@ -1028,8 +1049,8 @@ class QuantizationFreezePass(object):
                             quant_axis = 0
                         quantized_param_v = utils.quant_tensor(
                             param_v.copy(), scale_v, quant_axis,
-                            self._weight_bits)
-                        quantized_param_v = np.round(quantized_param_v)
+                            self._weight_bits, self._round_type)
+                        # Weight bias correction
                         if self._bias_correction == True:
                             quantized_param_v = utils.bias_correction_w(
                                 param_v,
@@ -1037,7 +1058,6 @@ class QuantizationFreezePass(object):
                                 scale_v,
                                 quant_axis,
                                 weight_bits=self._weight_bits)
-                            quantized_param_v = np.round(quantized_param_v)
                         self._restore_var(input_arg_name, quantized_param_v)
                     self._remove_fake_quant_and_dequant_op(graph, op_node)
 
@@ -1580,7 +1600,8 @@ class AddQuantDequantPass(object):
                  quant_bits=8,
                  skip_pattern=["skip_quant"],
                  quantizable_op_type=["elementwise_add", "pool2d"],
-                 is_full_quantized=False):
+                 is_full_quantized=False,
+                 round_type='TiesToEven'):
         """
         Constructor.
 
@@ -1602,6 +1623,10 @@ class AddQuantDequantPass(object):
                 quantization to all supported quantizable op type. If set is_full_quantized
                 as False, only apply quantization to the op type according to the input 
                 quantizable_op_type.
+            round_type(str, optional): The method of converting the tensor value float->int.
+                Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+                Default is `TiesToEven`, which is rounding to nearest ties to even. 
+                'TiesAwayFromZero' is rounding to nearest ties away from zero.
         """
         self._scope = scope
         self._place = _get_paddle_place(place)
@@ -1609,6 +1634,7 @@ class AddQuantDequantPass(object):
         self._quant_bits = quant_bits
         self._is_test = None
         self._skip_pattern = skip_pattern
+        self._round_type = round_type
 
         if is_full_quantized:
             self._quantizable_op_type = utils._act_supported_quantizable_op_type
@@ -1743,8 +1769,10 @@ class AddQuantDequantPass(object):
             outs['OutState'] = state_out_node
             outs['OutAccum'] = accum_out_node
 
+        round_type = 0 if self._round_type == 'TiesToEven' else 1
         attrs = {
             'bit_length': quant_bits,
+            'round_type': round_type,
             'moving_rate': self._moving_rate,
             'is_test': self._is_test,
             'op_role': core.op_proto_and_checker_maker.OpRole.Forward
@@ -1784,6 +1812,10 @@ class InsertQuantizeLinear(object):
             Default is -1.
         channel_wise(bool, optional): Whether quantization with per channel or not. Default is False.
         is_test(bool, optional): Whether quantization with training or not. Default is True.
+        round_type(str, optional): The method of converting the tensor value float->int.
+            Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+            Default is `TiesToEven`, which is rounding to nearest ties to even. 
+            'TiesAwayFromZero' is rounding to nearest ties away from zero.
     """
 
     def __init__(self,
@@ -1792,13 +1824,15 @@ class InsertQuantizeLinear(object):
                  quant_bits=8,
                  quant_axis=-1,
                  channel_wise=False,
-                 is_test=True):
+                 is_test=True,
+                 round_type='TiesToEven'):
         self._place = place
         self._scope = scope
         self.quant_bits = quant_bits
         self.quant_axis = quant_axis
         self.channel_wise = channel_wise
         self._is_test = is_test
+        self._round_type = round_type
 
     def insert_quant_op(self, graph, var_node):
         assert var_node.is_var(), '{} is not a var'.format(var_node.name())
@@ -1841,7 +1875,12 @@ class InsertQuantizeLinear(object):
         if zero_point_node is not None:
             inputs["ZeroPoint"] = zero_point_node
 
-        attrs = {"quant_axis": self.quant_axis, "bit_length": self.quant_bits}
+        round_type = 0 if self._round_type == 'TiesToEven' else 1
+        attrs = {
+            "quant_axis": self.quant_axis,
+            "bit_length": self.quant_bits,
+            "round_type": round_type
+        }
         outputs = {"Y": quant_var_node}
         if not self._is_test:
             attrs["is_test"] = self._is_test
@@ -1946,6 +1985,7 @@ class QuantizationTransformPassV2(object):
                  moving_rate=0.9,
                  skip_pattern=['skip_quant'],
                  quantizable_op_type=['conv2d', 'depthwise_conv2d', 'mul'],
+                 round_type='TiesToEven',
                  weight_quantize_func=None,
                  act_quantize_func=None,
                  weight_preprocess_func=None,
@@ -1981,6 +2021,10 @@ class QuantizationTransformPassV2(object):
             quantizable_op_type(list[str]): List the type of ops that will be quantized. 
                 Default is ["conv2d", "depthwise_conv2d", "mul"]. The quantizable_op_type in
                 QuantizationFreezePass and ConvertToInt8Pass must be the same as this.
+            round_type(str, optional): The method of converting the tensor value float->int.
+                Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+                Default is `TiesToEven`, which is rounding to nearest ties to even. 
+                'TiesAwayFromZero' is rounding to nearest ties away from zero.
             weight_quantize_func(function): Function that defines how to quantize weight.
                 Using this can quickly test if user's quantization method works or not.
                 In this function, user should both define quantization function and
@@ -2030,6 +2074,7 @@ class QuantizationTransformPassV2(object):
         self._weight_bits = weight_bits
         self._activation_bits = activation_bits
         self._skip_pattern = skip_pattern
+        self._round_type = round_type
         self._weight_quantize_func = weight_quantize_func
         self._act_quantize_func = act_quantize_func
         self._weight_preprocess_func = weight_preprocess_func
@@ -2153,7 +2198,8 @@ class QuantizationTransformPassV2(object):
                     quant_bits=quant_bits,
                     quant_axis=quant_axis,
                     channel_wise=channel_wise,
-                    is_test=self._is_test)
+                    is_test=self._is_test,
+                    round_type=self._round_type)
                 quant_var_node, scale_var_node = insert_quant_pass.insert_quant_op(
                     graph, var_node)
                 dequant_var_node = insert_quant_pass.insert_dequant_op(
@@ -2261,7 +2307,8 @@ class AddQuantDequantPassV2(object):
                  quant_bits=8,
                  skip_pattern=["skip_quant"],
                  quantizable_op_type=["elementwise_add", "pool2d"],
-                 is_full_quantized=False):
+                 is_full_quantized=False,
+                 round_type='TiesToEven'):
         """
         Args:
             scope(paddle.Scope): The scope is used to initialize these new parameters.
@@ -2281,6 +2328,10 @@ class AddQuantDequantPassV2(object):
                 quantization to all supported quantizable op type. If set is_full_quantized
                 as False, only apply quantization to the op type according to the input 
                 quantizable_op_type.
+            round_type(str, optional): The method of converting the tensor value float->int.
+                Currently supports ['TiesToEven', 'TiesAwayFromZero'] methods.
+                Default is `TiesToEven`, which is rounding to nearest ties to even. 
+                'TiesAwayFromZero' is rounding to nearest ties away from zero.
         
         Examples:
         .. code-block:: python
@@ -2303,6 +2354,7 @@ class AddQuantDequantPassV2(object):
         self._quant_bits = quant_bits
         self._is_test = None
         self._skip_pattern = skip_pattern
+        self._round_type = round_type
 
         if is_full_quantized:
             self._quantizable_op_type = utils._act_supported_quantizable_op_type
@@ -2375,7 +2427,8 @@ class AddQuantDequantPassV2(object):
                                 quant_bits=self._quant_bits,
                                 quant_axis=-1,
                                 channel_wise=False,
-                                is_test=self._is_test)
+                                is_test=self._is_test,
+                                round_type=self._round_type)
                             quant_var_node, scale_var_node = insert_quant_pass.insert_quant_op(
                                 graph, in_node)
                             dequant_var_node = insert_quant_pass.insert_dequant_op(
@@ -2458,6 +2511,8 @@ class ReplaceFakeQuantDequantPass(object):
             "quant_axis") else -1
         bit_length = op.op().attr("bit_length") if op.op().has_attr(
             "bit_length") else 8
+        round_type = op.op().attr("round_type") if op.op().has_attr(
+            "round_type") else 0
 
         zero_point_node = None
         quanted_node = x_node
@@ -2479,7 +2534,8 @@ class ReplaceFakeQuantDequantPass(object):
         quant_op_node = graph.create_op_node(op_type="quantize_linear",
                                              attrs={
                                                  "quant_axis": quant_axis,
-                                                 "bit_length": bit_length
+                                                 "bit_length": bit_length,
+                                                 "round_type": round_type
                                              },
                                              inputs={
                                                  "X": x_node,
@@ -2598,8 +2654,11 @@ class QuantWeightPass(object):
                 param_v = self._load_var(x_node.name())
                 quant_axis = _op.op().attr("quant_axis")
                 bits_length = _op.op().attr("bit_length")
+                round_type = _op.op().attr("round_type") if _op.op().has_attr(
+                    "round_type") else 0
                 quantized_param_v = utils.quant_tensor(param_v.copy(), scale_v,
-                                                       quant_axis, bits_length)
+                                                       quant_axis, bits_length,
+                                                       round_type)
                 if self._bias_correction == True:
                     quantized_param_v = utils.bias_correction_w(
                         param_v,

python/paddle/fluid/contrib/slim/quantization/utils.py

@@ -321,29 +321,39 @@ def set_variable_data(scope, place, var_name, np_value):
         tensor.set(np_value, place)
 
 
-def quant_tensor(x, scale, quant_axis=0, weight_bits=8):
-    # symmetry quant
-    def _clip(x, scale):
-        x[x > scale] = scale
-        x[x < -scale] = -scale
-        return x
+def round_c_single_element(val):
+    dtype = type(val)
+    if val >= 0:
+        return dtype(np.floor(val + 0.5))
+    return dtype(np.ceil(val - 0.5))
+
+
+# rounding to nearest ties away from zero
+round_c = np.vectorize(round_c_single_element)
+
 
+def quant_tensor(x,
+                 scale,
+                 quant_axis=0,
+                 weight_bits=8,
+                 round_type='TiesToEven'):
     assert quant_axis in [0, 1], 'quant_axis should be 0 or 1 for now.'
+    distribution = np.round if round_type == 'TiesToEven' else round_c
     bnt = (1 << (weight_bits - 1)) - 1
     if isinstance(scale, list):
         for i, s in enumerate(scale):
             if s == 0.0:
                 s = 1e-8
             if quant_axis == 0:
-                x[i] = _clip(x[i], s)
-                x[i] = x[i] / s * bnt
+                x[i] = distribution(x[i] / s * bnt)
+                x[i] = np.clip(x[i], -bnt - 1, bnt)
             else:
-                x[:, i] = _clip(x[:, i], s)
-                x[:, i] = x[:, i] / s * bnt
+                x[:, i] = distribution(x[:, i] / s * bnt)
+                x[:, i] = np.clip(x[:, i], -bnt - 1, bnt)
     else:
         scale = 1e-8 if scale == 0.0 else scale
-        x = _clip(x, scale)
-        x = x / scale * bnt
+        x = distribution(x / scale * bnt)
+        x = np.clip(x, -bnt - 1, bnt)
     return x
 
 

python/paddle/fluid/contrib/slim/tests/CMakeLists.txt

@@ -558,7 +558,7 @@ if(LINUX AND WITH_MKLDNN)
                                                                      120)
   set_tests_properties(test_quant2_int8_ernie_mkldnn PROPERTIES TIMEOUT 120)
   set_tests_properties(test_quant_int8_googlenet_mkldnn PROPERTIES TIMEOUT 120)
-  set_tests_properties(test_quant2_int8_resnet50_mkldnn PROPERTIES TIMEOUT 120)
+  set_tests_properties(test_quant2_int8_resnet50_mkldnn PROPERTIES TIMEOUT 200)
   set_tests_properties(test_quant2_int8_lstm_mkldnn PROPERTIES TIMEOUT 120)
 endif()
 

python/paddle/fluid/contrib/slim/tests/test_imperative_ptq.py

@@ -338,7 +338,7 @@ class TestImperativePTQKL(TestImperativePTQ):
 
         self.batch_num = 10
         self.batch_size = 10
-        self.eval_acc_top1 = 1.0
+        self.eval_acc_top1 = 0.98
 
         conv2d_1_wt_thresholds = [
             0.18116560578346252, 0.17079241573810577, 0.1702047884464264,

python/paddle/fluid/contrib/slim/tests/test_post_training_quantization_lstm_model.py

@@ -165,7 +165,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                                  model_path,
                                  data_path,
                                  algo="KL",
-                                 round_type="round",
+                                 weight_round_algo="round",
                                  quantizable_op_type=["conv2d"],
                                  is_full_quantize=False,
                                  is_use_cache_file=False,
@@ -185,7 +185,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                                        batch_nums=batch_nums,
                                        algo=algo,
                                        quantizable_op_type=quantizable_op_type,
-                                       round_type=round_type,
+                                       weight_round_algo=weight_round_algo,
                                        is_full_quantize=is_full_quantize,
                                        optimize_model=is_optimize_model,
                                        onnx_format=onnx_format,
@@ -201,7 +201,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                  data_url,
                  data_md5,
                  algo,
-                 round_type,
+                 weight_round_algo,
                  quantizable_op_type,
                  is_full_quantize,
                  is_use_cache_file,
@@ -224,7 +224,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
         print("Start post training quantization for {0} on {1} samples ...".
               format(model_name, quant_iterations))
         self.generate_quantized_model(fp32_model_path, data_path, algo,
-                                      round_type, quantizable_op_type,
+                                      weight_round_algo, quantizable_op_type,
                                       is_full_quantize, is_use_cache_file,
                                       is_optimize_model, quant_iterations,
                                       onnx_format)
@@ -255,7 +255,7 @@ class TestPostTrainingAvgForLSTM(TestPostTrainingQuantization):
         data_url = "https://paddle-inference-dist.cdn.bcebos.com/int8/unittest_model_data/quant_lstm_input_data.tar.gz"
         data_md5 = "add84c754e9b792fea1fbd728d134ab7"
         algo = "avg"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["mul", "lstm"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -264,7 +264,7 @@ class TestPostTrainingAvgForLSTM(TestPostTrainingQuantization):
         infer_iterations = 100
         quant_iterations = 10
         self.run_test(model_name, model_url, model_md5, data_name, data_url,
-                      data_md5, algo, round_type, quantizable_op_type,
+                      data_md5, algo, weight_round_algo, quantizable_op_type,
                       is_full_quantize, is_use_cache_file, is_optimize_model,
                       diff_threshold, infer_iterations, quant_iterations)
 
@@ -279,7 +279,7 @@ class TestPostTrainingAvgForLSTMONNXFormat(TestPostTrainingQuantization):
         data_url = "https://paddle-inference-dist.cdn.bcebos.com/int8/unittest_model_data/quant_lstm_input_data.tar.gz"
         data_md5 = "add84c754e9b792fea1fbd728d134ab7"
         algo = "avg"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["mul", "lstm"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -295,7 +295,7 @@ class TestPostTrainingAvgForLSTMONNXFormat(TestPostTrainingQuantization):
                       data_url,
                       data_md5,
                       algo,
-                      round_type,
+                      weight_round_algo,
                       quantizable_op_type,
                       is_full_quantize,
                       is_use_cache_file,

python/paddle/fluid/contrib/slim/tests/test_post_training_quantization_mnist.py

@@ -108,7 +108,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
     def generate_quantized_model(self,
                                  model_path,
                                  algo="KL",
-                                 round_type="round",
+                                 weight_round_algo="round",
                                  quantizable_op_type=["conv2d"],
                                  is_full_quantize=False,
                                  is_use_cache_file=False,
@@ -116,7 +116,8 @@ class TestPostTrainingQuantization(unittest.TestCase):
                                  batch_size=10,
                                  batch_nums=10,
                                  onnx_format=False,
-                                 skip_tensor_list=None):
+                                 skip_tensor_list=None,
+                                 bias_correction=False):
 
         place = fluid.CPUPlace()
         exe = fluid.Executor(place)
@@ -129,9 +130,10 @@ class TestPostTrainingQuantization(unittest.TestCase):
                                        batch_nums=batch_nums,
                                        algo=algo,
                                        quantizable_op_type=quantizable_op_type,
-                                       round_type=round_type,
+                                       weight_round_algo=weight_round_algo,
                                        is_full_quantize=is_full_quantize,
                                        optimize_model=is_optimize_model,
+                                       bias_correction=bias_correction,
                                        onnx_format=onnx_format,
                                        skip_tensor_list=skip_tensor_list,
                                        is_use_cache_file=is_use_cache_file)
@@ -143,7 +145,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                  data_url,
                  data_md5,
                  algo,
-                 round_type,
+                 weight_round_algo,
                  quantizable_op_type,
                  is_full_quantize,
                  is_use_cache_file,
@@ -152,6 +154,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                  batch_size=10,
                  infer_iterations=10,
                  quant_iterations=5,
+                 bias_correction=False,
                  onnx_format=False,
                  skip_tensor_list=None):
 
@@ -166,11 +169,12 @@ class TestPostTrainingQuantization(unittest.TestCase):
 
         print("Start INT8 post training quantization for {0} on {1} images ...".
               format(model_name, quant_iterations * batch_size))
-        self.generate_quantized_model(origin_model_path, algo, round_type,
-                                      quantizable_op_type, is_full_quantize,
-                                      is_use_cache_file, is_optimize_model,
-                                      batch_size, quant_iterations, onnx_format,
-                                      skip_tensor_list)
+        self.generate_quantized_model(origin_model_path, algo,
+                                      weight_round_algo, quantizable_op_type,
+                                      is_full_quantize, is_use_cache_file,
+                                      is_optimize_model, batch_size,
+                                      quant_iterations, onnx_format,
+                                      skip_tensor_list, bias_correction)
 
         print("Start INT8 inference for {0} on {1} images ...".format(
             model_name, infer_iterations * batch_size))
@@ -200,7 +204,7 @@ class TestPostTrainingKLForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "KL"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -209,7 +213,7 @@ class TestPostTrainingKLForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -222,7 +226,7 @@ class TestPostTraininghistForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "hist"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -231,7 +235,7 @@ class TestPostTraininghistForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -244,7 +248,7 @@ class TestPostTrainingmseForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "mse"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -253,7 +257,7 @@ class TestPostTrainingmseForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -266,7 +270,7 @@ class TestPostTrainingemdForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "emd"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -275,7 +279,7 @@ class TestPostTrainingemdForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -288,7 +292,7 @@ class TestPostTrainingavgForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "avg"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -297,7 +301,7 @@ class TestPostTrainingavgForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -310,7 +314,7 @@ class TestPostTrainingAbsMaxForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "abs_max"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "mul"]
         is_full_quantize = True
         is_use_cache_file = False
@@ -319,7 +323,7 @@ class TestPostTrainingAbsMaxForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 10
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -332,7 +336,7 @@ class TestPostTrainingmseAdaroundForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "mse"
-        round_type = "adaround"
+        weight_round_algo = "adaround"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -341,10 +345,21 @@ class TestPostTrainingmseAdaroundForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
-                      quantizable_op_type, is_full_quantize, is_use_cache_file,
-                      is_optimize_model, diff_threshold, batch_size,
-                      infer_iterations, quant_iterations)
+        bias_correction = True
+        self.run_test(model_name,
+                      data_url,
+                      data_md5,
+                      algo,
+                      weight_round_algo,
+                      quantizable_op_type,
+                      is_full_quantize,
+                      is_use_cache_file,
+                      is_optimize_model,
+                      diff_threshold,
+                      batch_size,
+                      infer_iterations,
+                      quant_iterations,
+                      bias_correction=bias_correction)
 
 
 class TestPostTrainingKLAdaroundForMnist(TestPostTrainingQuantization):
@@ -354,7 +369,7 @@ class TestPostTrainingKLAdaroundForMnist(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "KL"
-        round_type = "adaround"
+        weight_round_algo = "adaround"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -363,7 +378,7 @@ class TestPostTrainingKLAdaroundForMnist(TestPostTrainingQuantization):
         batch_size = 10
         infer_iterations = 50
         quant_iterations = 5
-        self.run_test(model_name, data_url, data_md5, algo, round_type,
+        self.run_test(model_name, data_url, data_md5, algo, weight_round_algo,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold, batch_size,
                       infer_iterations, quant_iterations)
@@ -376,7 +391,7 @@ class TestPostTrainingmseForMnistONNXFormat(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "mse"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -390,7 +405,7 @@ class TestPostTrainingmseForMnistONNXFormat(TestPostTrainingQuantization):
                       data_url,
                       data_md5,
                       algo,
-                      round_type,
+                      weight_round_algo,
                       quantizable_op_type,
                       is_full_quantize,
                       is_use_cache_file,
@@ -410,7 +425,7 @@ class TestPostTrainingmseForMnistONNXFormatFullQuant(
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "mse"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = True
         is_use_cache_file = False
@@ -424,7 +439,7 @@ class TestPostTrainingmseForMnistONNXFormatFullQuant(
                       data_url,
                       data_md5,
                       algo,
-                      round_type,
+                      weight_round_algo,
                       quantizable_op_type,
                       is_full_quantize,
                       is_use_cache_file,
@@ -443,7 +458,7 @@ class TestPostTrainingavgForMnistSkipOP(TestPostTrainingQuantization):
         data_url = "http://paddle-inference-dist.bj.bcebos.com/int8/mnist_model.tar.gz"
         data_md5 = "be71d3997ec35ac2a65ae8a145e2887c"
         algo = "avg"
-        round_type = "round"
+        weight_round_algo = "round"
         quantizable_op_type = ["conv2d", "depthwise_conv2d", "mul"]
         is_full_quantize = False
         is_use_cache_file = False
@@ -457,7 +472,7 @@ class TestPostTrainingavgForMnistSkipOP(TestPostTrainingQuantization):
                       data_url,
                       data_md5,
                       algo,
-                      round_type,
+                      weight_round_algo,
                       quantizable_op_type,
                       is_full_quantize,
                       is_use_cache_file,

python/paddle/fluid/contrib/slim/tests/test_post_training_quantization_mobilenetv1.py

@@ -242,7 +242,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                                  model_path,
                                  quantizable_op_type,
                                  algo="KL",
-                                 round_type="round",
+                                 weight_round_algo="round",
                                  is_full_quantize=False,
                                  is_use_cache_file=False,
                                  is_optimize_model=False,
@@ -264,7 +264,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
                                        model_dir=model_path,
                                        algo=algo,
                                        quantizable_op_type=quantizable_op_type,
-                                       round_type=round_type,
+                                       weight_round_algo=weight_round_algo,
                                        is_full_quantize=is_full_quantize,
                                        optimize_model=is_optimize_model,
                                        onnx_format=onnx_format,
@@ -275,7 +275,7 @@ class TestPostTrainingQuantization(unittest.TestCase):
     def run_test(self,
                  model,
                  algo,
-                 round_type,
+                 weight_round_algo,
                  data_urls,
                  data_md5s,
                  quantizable_op_type,
@@ -299,9 +299,10 @@ class TestPostTrainingQuantization(unittest.TestCase):
         print("Start INT8 post training quantization for {0} on {1} images ...".
               format(model, sample_iterations * batch_size))
         self.generate_quantized_model(model_cache_folder + "/model",
-                                      quantizable_op_type, algo, round_type,
-                                      is_full_quantize, is_use_cache_file,
-                                      is_optimize_model, onnx_format)
+                                      quantizable_op_type, algo,
+                                      weight_round_algo, is_full_quantize,
+                                      is_use_cache_file, is_optimize_model,
+                                      onnx_format)
 
         print("Start INT8 inference for {0} on {1} images ...".format(
             model, infer_iterations * batch_size))
@@ -329,7 +330,7 @@ class TestPostTrainingKLForMobilenetv1(TestPostTrainingQuantization):
     def test_post_training_kl_mobilenetv1(self):
         model = "MobileNet-V1"
         algo = "KL"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/mobilenetv1_int8_model.tar.gz'
         ]
@@ -344,7 +345,7 @@ class TestPostTrainingKLForMobilenetv1(TestPostTrainingQuantization):
         is_use_cache_file = False
         is_optimize_model = True
         diff_threshold = 0.025
-        self.run_test(model, algo, round_type, data_urls, data_md5s,
+        self.run_test(model, algo, weight_round_algo, data_urls, data_md5s,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold)
 
@@ -354,7 +355,7 @@ class TestPostTrainingavgForMobilenetv1(TestPostTrainingQuantization):
     def test_post_training_avg_mobilenetv1(self):
         model = "MobileNet-V1"
         algo = "avg"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/mobilenetv1_int8_model.tar.gz'
         ]
@@ -368,7 +369,7 @@ class TestPostTrainingavgForMobilenetv1(TestPostTrainingQuantization):
         is_use_cache_file = False
         is_optimize_model = True
         diff_threshold = 0.025
-        self.run_test(model, algo, round_type, data_urls, data_md5s,
+        self.run_test(model, algo, weight_round_algo, data_urls, data_md5s,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold)
 
@@ -378,7 +379,7 @@ class TestPostTraininghistForMobilenetv1(TestPostTrainingQuantization):
     def test_post_training_hist_mobilenetv1(self):
         model = "MobileNet-V1"
         algo = "hist"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/mobilenetv1_int8_model.tar.gz'
         ]
@@ -392,7 +393,7 @@ class TestPostTraininghistForMobilenetv1(TestPostTrainingQuantization):
         is_use_cache_file = False
         is_optimize_model = True
         diff_threshold = 0.03
-        self.run_test(model, algo, round_type, data_urls, data_md5s,
+        self.run_test(model, algo, weight_round_algo, data_urls, data_md5s,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold)
 
@@ -402,7 +403,7 @@ class TestPostTrainingAbsMaxForMobilenetv1(TestPostTrainingQuantization):
     def test_post_training_abs_max_mobilenetv1(self):
         model = "MobileNet-V1"
         algo = "abs_max"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/mobilenetv1_int8_model.tar.gz'
         ]
@@ -416,7 +417,7 @@ class TestPostTrainingAbsMaxForMobilenetv1(TestPostTrainingQuantization):
         is_optimize_model = False
         # The accuracy diff of post-training quantization (abs_max) maybe bigger
         diff_threshold = 0.05
-        self.run_test(model, algo, round_type, data_urls, data_md5s,
+        self.run_test(model, algo, weight_round_algo, data_urls, data_md5s,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold)
 
@@ -426,7 +427,7 @@ class TestPostTrainingAvgONNXFormatForMobilenetv1(TestPostTrainingQuantization):
     def test_post_training_onnx_format_mobilenetv1(self):
         model = "MobileNet-V1"
         algo = "avg"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/mobilenetv1_int8_model.tar.gz'
         ]
@@ -443,7 +444,7 @@ class TestPostTrainingAvgONNXFormatForMobilenetv1(TestPostTrainingQuantization):
         diff_threshold = 0.05
         self.run_test(model,
                       algo,
-                      round_type,
+                      weight_round_algo,
                       data_urls,
                       data_md5s,
                       quantizable_op_type,

python/paddle/fluid/contrib/slim/tests/test_post_training_quantization_resnet50.py

@@ -25,7 +25,7 @@ class TestPostTrainingForResnet50(TestPostTrainingQuantization):
     def test_post_training_resnet50(self):
         model = "ResNet-50"
         algo = "min_max"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/resnet50_int8_model.tar.gz'
         ]
@@ -35,7 +35,7 @@ class TestPostTrainingForResnet50(TestPostTrainingQuantization):
         is_use_cache_file = False
         is_optimize_model = False
         diff_threshold = 0.025
-        self.run_test(model, algo, round_type, data_urls, data_md5s,
+        self.run_test(model, algo, weight_round_algo, data_urls, data_md5s,
                       quantizable_op_type, is_full_quantize, is_use_cache_file,
                       is_optimize_model, diff_threshold)
 
@@ -45,7 +45,7 @@ class TestPostTrainingForResnet50ONNXFormat(TestPostTrainingQuantization):
     def test_post_training_resnet50(self):
         model = "ResNet-50"
         algo = "min_max"
-        round_type = "round"
+        weight_round_algo = "round"
         data_urls = [
             'http://paddle-inference-dist.bj.bcebos.com/int8/resnet50_int8_model.tar.gz'
         ]
@@ -58,7 +58,7 @@ class TestPostTrainingForResnet50ONNXFormat(TestPostTrainingQuantization):
         onnx_format = True
         self.run_test(model,
                       algo,
-                      round_type,
+                      weight_round_algo,
                       data_urls,
                       data_md5s,
                       quantizable_op_type,

python/paddle/fluid/tests/unittests/test_fake_quantize_op.py

@@ -21,8 +21,6 @@ import math
 from op_test import OpTest
 
 
-# numpy.round has different behavior in comparision to c++ round function
-# so we use round_c instead of numpy.round to align the output data
 def round_c_single_element(val):
     dtype = type(val)
     if val >= 0:
@@ -30,6 +28,7 @@ def round_c_single_element(val):
     return dtype(np.ceil(val - 0.5))
 
 
+# rounding to nearest ties away from zero
 round_c = np.vectorize(round_c_single_element)
 
 
@@ -46,13 +45,25 @@ class TestFakeQuantizeAbsMaxOp(OpTest):
         self.op_type = 'fake_quantize_abs_max'
         self.attrs = {'bit_length': 8}
 
-    def _fake_quantize_abs_max(self, dtype, input_shape, distribution):
+    def _fake_quantize_abs_max(self,
+                               dtype,
+                               input_shape,
+                               distribution,
+                               round_type='TiesToEven'):
         input_data = distribution(input_shape).astype(dtype)
         compute_type = get_compute_type(dtype)
         scale = np.max(np.abs(input_data))
         bnt = (1 << (self.attrs['bit_length'] - 1)) - 1
         inv_scale = 1.0 / (scale + 1e-6) if scale < 1e-30 else 1.0 / scale
-        output_data = round_c(input_data.astype(compute_type) * inv_scale * bnt)
+        if round_type == 'TiesToEven':
+            round_out = np.round(
+                input_data.astype(compute_type) * inv_scale * bnt)
+            self.attrs['round_type'] = 0
+        else:
+            round_out = round_c(
+                input_data.astype(compute_type) * inv_scale * bnt)
+            self.attrs['round_type'] = 1
+        output_data = np.clip(round_out, -bnt - 1, bnt)
         self.inputs = {'X': input_data}
         self.outputs = {'Out': output_data, 'OutScale': scale}
         self.dtype = dtype
@@ -61,6 +72,11 @@ class TestFakeQuantizeAbsMaxOp(OpTest):
     def test_fake_quantize_abs_max(self):
         self._fake_quantize_abs_max(np.float32, (124, 240), np.random.random)
 
+    def test_fake_quantize_abs_max_round1(self):
+        self._fake_quantize_abs_max(np.float32, (124, 240),
+                                    np.random.random,
+                                    round_type='TiesAwayFromZero')
+
     def test_fake_quantize_abs_max_float16(self):
         self._fake_quantize_abs_max(np.float16, (124, 240), np.random.random)
 
@@ -78,8 +94,12 @@ class TestFakeChannelWiseQuantizeAbsMaxOp(OpTest):
         self.op_type = 'fake_channel_wise_quantize_abs_max'
         self.attrs = {'bit_length': 8}
 
-    def _fake_channel_wise_quantize_abs_max(self, dtype, input_shape,
-                                            quant_axis, distribution):
+    def _fake_channel_wise_quantize_abs_max(self,
+                                            dtype,
+                                            input_shape,
+                                            quant_axis,
+                                            distribution,
+                                            round_type='TiesToEven'):
         assert quant_axis in [0, 1], 'quant_axis should be 0 or 1.'
         input_data = distribution(input_shape).astype(dtype)
         compute_type = get_compute_type(dtype)
@@ -87,8 +107,15 @@ class TestFakeChannelWiseQuantizeAbsMaxOp(OpTest):
         compute_axis = tuple(i for i in range(len(input_shape))
                              if i != quant_axis)
         scale_broadcast = np.amax(input_data, axis=compute_axis, keepdims=True)
-        output_data = round_c(bnt * input_data.astype(compute_type) /
-                              scale_broadcast)
+        if round_type == 'TiesToEven':
+            round_out = np.round(
+                input_data.astype(compute_type) / scale_broadcast * bnt)
+            self.attrs['round_type'] = 0
+        else:
+            round_out = round_c(
+                input_data.astype(compute_type) / scale_broadcast * bnt)
+            self.attrs['round_type'] = 1
+        output_data = np.clip(round_out, -bnt - 1, bnt)
         if quant_axis == 1:
             scale_broadcast = np.transpose(scale_broadcast,
                                            (1, ) + compute_axis)
@@ -102,16 +129,20 @@ class TestFakeChannelWiseQuantizeAbsMaxOp(OpTest):
     def test_fake_channel_wise_quantize_abs_max(self):
         dtype_options = [np.float32, np.float16]
         input_shape_quant_axis_options = [[(20, 15, 6, 6), 0],
-                                          [(15, 20, 5, 5), 1], [(30, 15), 0],
-                                          [(30, 15), 1]]
-        for dtype, input_shape_quant_axis in itertools.product(
-                dtype_options, input_shape_quant_axis_options):
+                                          [(20, 15, 6, 6), 1], [(30, 30), 0],
+                                          [(30, 30), 1]]
+        round_type_options = ['TiesToEven', 'TiesAwayFromZero']
+        for dtype, input_shape_quant_axis, round_type in itertools.product(
+                dtype_options, input_shape_quant_axis_options,
+                round_type_options):
             input_shape, quant_axis = input_shape_quant_axis
             with self.subTest(dtype=dtype,
                               input_shape=input_shape,
-                              quant_axis=quant_axis):
+                              quant_axis=quant_axis,
+                              round_type=round_type):
                 self._fake_channel_wise_quantize_abs_max(
-                    dtype, input_shape, quant_axis, np.random.random)
+                    dtype, input_shape, quant_axis, np.random.random,
+                    round_type)
 
 
 class TestFakeQuantizeRangeAbsMaxOp(OpTest):
@@ -124,7 +155,8 @@ class TestFakeQuantizeRangeAbsMaxOp(OpTest):
                                      dtype,
                                      input_shape,
                                      distribution,
-                                     is_test=False):
+                                     is_test=False,
+                                     round_type='TiesToEven'):
         input_data = distribution(input_shape).astype(dtype)
         compute_type = get_compute_type(dtype)
         bnt = (1 << (self.attrs['bit_length'] - 1)) - 1
@@ -133,11 +165,15 @@ class TestFakeQuantizeRangeAbsMaxOp(OpTest):
         out_scale[0] = np.max(np.abs(input_data))
         if is_test:
             out_scale[0] = in_scale[0] = out_scale[0] - 1.0
-            clip_data = np.clip(input_data, -in_scale, in_scale)
+        if round_type == 'TiesToEven':
+            round_out = np.round(
+                input_data.astype(compute_type) / out_scale[0] * bnt)
+            self.attrs['round_type'] = 0
         else:
-            clip_data = input_data
-        output_data = round_c(
-            clip_data.astype(compute_type) / out_scale[0] * bnt)
+            round_out = round_c(
+                input_data.astype(compute_type) / out_scale[0] * bnt)
+            self.attrs['round_type'] = 1
+        output_data = np.clip(round_out, -bnt - 1, bnt)
         self.inputs = {
             'X': input_data,
             'Iter': np.zeros(1).astype(np.int64),
@@ -153,15 +189,20 @@ class TestFakeQuantizeRangeAbsMaxOp(OpTest):
         self.check_output()
 
     def test_fake_quantize_range_abs_max(self):
-        dtype_options = [np.float32, np.float16]
+        dtype_options = [np.float16, np.float32]
         is_test_options = [False, True]
-        for dtype, is_test in itertools.product(dtype_options, is_test_options):
+        round_type_options = ['TiesToEven', 'TiesAwayFromZero']
+        for dtype, is_test, round_type in itertools.product(
+                dtype_options, is_test_options, round_type_options):
             self.attrs['bit_length'] = 8 if is_test else 5
-            with self.subTest(dtype=dtype, is_test=is_test):
+            with self.subTest(dtype=dtype,
+                              is_test=is_test,
+                              round_type=round_type):
                 self._fake_quantize_range_abs_max(
-                    dtype, (8, 16, 7, 7),
-                    lambda shape: (np.random.random(shape) - 0.5) * 10,
-                    is_test=is_test)
+                    dtype, (8, 16, 6, 6),
+                    lambda shape: (np.random.random(shape) - 0.4) * 10,
+                    is_test=is_test,
+                    round_type=round_type)
 
 
 class TestMovingAverageAbsMaxScaleOp(OpTest):
@@ -208,7 +249,8 @@ class TestFakeQuantizeMovingAverageAbsMaxOp(OpTest):
                                               input_shape,
                                               distribution,
                                               dequantize=False,
-                                              with_gradient=False):
+                                              with_gradient=False,
+                                              round_type='TiesToEven'):
         input_data = distribution(input_shape).astype(dtype)
         compute_type = get_compute_type(dtype)
         bnt = (1 << (self.attrs['bit_length'] - 1)) - 1
@@ -222,12 +264,20 @@ class TestFakeQuantizeMovingAverageAbsMaxOp(OpTest):
             np.abs(input_data))
         out_state[0] = self.attrs['moving_rate'] * in_state[0] + 1.0
         out_scale = out_accum / out_state
-        round_data = round_c(input_data.astype(compute_type) / out_scale * bnt)
+        if round_type == 'TiesToEven':
+            round_out = np.round(
+                input_data.astype(compute_type) / out_scale * bnt)
+            self.attrs['round_type'] = 0
+        else:
+            round_out = round_c(
+                input_data.astype(compute_type) / out_scale * bnt)
+            self.attrs['round_type'] = 1
+        quant_data = np.clip(round_out, -bnt - 1, bnt)
         if dequantize:
-            output_data = (round_data * out_scale / bnt).astype(dtype)
+            output_data = (quant_data * out_scale / bnt).astype(dtype)
             self.op_type = 'fake_quantize_dequantize_moving_average_abs_max'
         else:
-            output_data = round_data.astype(dtype)
+            output_data = quant_data.astype(dtype)
         self.inputs = {
             'X': input_data,
             'InScale': in_scale,
@@ -256,6 +306,12 @@ class TestFakeQuantizeMovingAverageAbsMaxOp(OpTest):
         self._fake_quantize_moving_average_abs_max(np.float16, (8, 16, 7, 7),
                                                    np.random.random)
 
+    def test_fake_quantize_moving_average_abs_max_round1(self):
+        self._fake_quantize_moving_average_abs_max(
+            np.float32, (8, 16, 7, 7),
+            np.random.random,
+            round_type='TiesAwayFromZero')
+
     def test_fake_quantize_dequantize_moving_average_abs_max(self):
         self._fake_quantize_moving_average_abs_max(np.float32, (8, 16, 7, 7),
                                                    np.random.random,
@@ -269,12 +325,21 @@ class TestFakeQuantizeDequantizeAbsMaxOp(OpTest):
         self.op_type = 'fake_quantize_dequantize_abs_max'
         self.attrs = {'bit_length': 8}
 
-    def _fake_quantize_dequantize_abs_max(self, dtype, input_shape,
-                                          distribution):
+    def _fake_quantize_dequantize_abs_max(self,
+                                          dtype,
+                                          input_shape,
+                                          distribution,
+                                          round_type='TiesToEven'):
         input_data = distribution(input_shape).astype(dtype)
         scale = np.max(np.abs(input_data)).astype(dtype)
         bnt = (1 << (self.attrs['bit_length'] - 1)) - 1
-        output_data = round_c(input_data / scale * bnt) * scale / bnt
+        if round_type == 'TiesToEven':
+            round_out = np.round(input_data / scale * bnt)
+            self.attrs['round_type'] = 0
+        else:
+            round_out = round_c(input_data / scale * bnt)
+            self.attrs['round_type'] = 1
+        output_data = np.clip(round_out, -bnt - 1, bnt) * scale / bnt
         self.inputs = {'X': input_data}
         self.outputs = {
             'Out': output_data,
@@ -289,6 +354,11 @@ class TestFakeQuantizeDequantizeAbsMaxOp(OpTest):
         self._fake_quantize_dequantize_abs_max(np.float32, (124, 240),
                                                np.random.random)
 
+    def test_fake_quantize_dequantize_abs_max_round1(self):
+        self._fake_quantize_dequantize_abs_max(np.float32, (124, 240),
+                                               np.random.random,
+                                               round_type='TiesAwayFromZero')
+
 
 class TestChannelWiseFakeQuantizeDequantizeAbsMaxOp(OpTest):
 
@@ -296,9 +366,12 @@ class TestChannelWiseFakeQuantizeDequantizeAbsMaxOp(OpTest):
         self.op_type = 'fake_channel_wise_quantize_dequantize_abs_max'
         self.attrs = {'bit_length': 8}
 
-    def _fake_channel_wise_quantize_dequantize_abs_max(self, dtype, input_shape,
+    def _fake_channel_wise_quantize_dequantize_abs_max(self,
+                                                       dtype,
+                                                       input_shape,
                                                        quant_axis,
-                                                       distribution):
+                                                       distribution,
+                                                       round_type='TiesToEven'):
         assert quant_axis in [0, 1], 'quant_axis should be 0 or 1.'
         input_data = distribution(input_shape).astype(dtype)
         compute_type = get_compute_type(dtype)
@@ -307,8 +380,13 @@ class TestChannelWiseFakeQuantizeDequantizeAbsMaxOp(OpTest):
         compute_axis = tuple(i for i in range(len(input_shape))
                              if i != quant_axis)
         scale_broadcast = np.amax(input_data, axis=compute_axis, keepdims=True)
-        output_data = round_c(
-            bnt * output_data / scale_broadcast) * scale_broadcast / bnt
+        if round_type == 'TiesToEven':
+            round_out = np.round(bnt * output_data / scale_broadcast)
+            self.attrs['round_type'] = 0
+        else:
+            round_out = round_c(bnt * output_data / scale_broadcast)
+            self.attrs['round_type'] = 1
+        output_data = np.clip(round_out, -bnt - 1, bnt) * scale_broadcast / bnt
         if quant_axis == 1:
             scale_broadcast = np.transpose(scale_broadcast,
                                            (1, ) + compute_axis)
@@ -325,10 +403,19 @@ class TestChannelWiseFakeQuantizeDequantizeAbsMaxOp(OpTest):
         input_shape_quant_axis_options = [[(3, 4, 64, 64), 0],
                                           [(15, 20, 5, 5), 1], [(30, 15), 0],
                                           [(30, 15), 1]]
-        for input_shape, quant_axis in input_shape_quant_axis_options:
-            with self.subTest(input_shape=input_shape, quant_axis=quant_axis):
+        round_type_options = ['TiesToEven', 'TiesAwayFromZero']
+        for input_shape_quant_axis, round_type in itertools.product(
+                input_shape_quant_axis_options, round_type_options):
+            input_shape, quant_axis = input_shape_quant_axis
+            with self.subTest(input_shape=input_shape,
+                              quant_axis=quant_axis,
+                              round_type=round_type):
                 self._fake_channel_wise_quantize_dequantize_abs_max(
-                    np.float32, input_shape, quant_axis, np.random.random)
+                    np.float32,
+                    input_shape,
+                    quant_axis,
+                    np.random.random,
+                    round_type=round_type)
 
 
 def quantize_max_abs(x, max_range):