Merge branch 'tangjian/lite/int8' into 'incubate/lite'

Tangjian/lite/int8

See merge request inference/paddlelite!61

paddle/fluid/lite/core/lite_tensor.h

@@ -47,6 +47,22 @@ class DDimLite : public DDimBase<DDimLite> {
                            std::multiplies<value_type>());
   }
   const std::vector<value_type> &data() const { return data_; }
+  value_type count(int start, int end) {
+    if (start < 0) {
+      start = 0;
+    }
+    if (end > size()) {
+      end = size();
+    }
+    if (end < start) {
+      end = start;
+    }
+    value_type sum = 1;
+    for (auto i = start; i < end; ++i) {
+      sum *= data_[i];
+    }
+    return sum;
+  }
 
  private:
   std::vector<value_type> data_;

paddle/fluid/lite/kernels/arm/conv_compute.cc

@@ -95,8 +95,44 @@ void ConvCompute::Run() {
 template <PrecisionType Ptype_out>
 void ConvComputeInt8<Ptype_out>::PrepareForRun() {
   auto& param = this->Param<param_t>();
+  auto x_dims = param.x->dims();
+  auto w_dims = param.filter->dims();
+  auto o_dims = param.output->dims();
+
   auto& ctx = this->ctx_->template As<ARMContext>();
-  impl_ = new lite::arm::math::GemmLikeConvInt8<Ptype_out>;
+
+  int win = x_dims[3];  // nchw
+  int hin = x_dims[2];
+  int ic = x_dims[1];
+  int bs = x_dims[0];
+  int ow = o_dims[3];
+  int oh = o_dims[2];
+  int oc = o_dims[1];
+  int kh = w_dims[2];  // oihw
+  int kw = w_dims[3];
+  int ph = param.paddings[1];
+  int pw = param.paddings[0];
+  int sh = param.strides[1];
+  int sw = param.strides[0];
+
+  bool kps_equal = (pw == ph) && (sh == sw) && (kw == kh);
+  bool no_dilation = (param.dilations[0] == 1) && (param.dilations[1] == 1);
+  bool flag_dw_3x3 = (kw == 3) && (ph == 1) && (sw == 1 || sw == 2);
+  bool flag_dw_5x5 = (kw == 5 && sw == 1 && ph == 2);
+  bool flag_dw = flag_dw_3x3 || flag_dw_5x5;
+
+  // weigth is int8 and bias is int32 so do not need trans
+  if (param.groups == ic && ic == oc && kps_equal && no_dilation && flag_dw) {
+    impl_ = new lite::arm::math::DepthwiseConvInt8<Ptype_out>;
+    VLOG(3) << "DepthwiseConv Int8";
+  } else if (param.groups == 1 && kw == 3 && (sw == 1 || sw == 2) &&
+             kps_equal && no_dilation) {
+    // impl_ = new lite::arm::math::DirectConv<Ptype_out>;
+  } else {
+    VLOG(3) << "GemmLikeConvInt8";
+    impl_ = new lite::arm::math::GemmLikeConvInt8<Ptype_out>;
+  }
+
   CHECK(this->impl_->create(param, &ctx));
 }