Add fp16 mul op support and bind paddle fp16 to numpy fp16 (#9017)

* add fp16 mul op support

* small fix

* fix bug

* small fix

* fix PADDLE_WITH_CUDA compiling issue

* reorg code

* test for pybind

* treate as float16 as uint16_t in pybind

* bind np.float16 to paddle float16

* small fix

* clean code

* remove redundancy

* fix mul_op test

* address comments

* small fix

* add is_float16_supported func

paddle/fluid/operators/mul_op.cc

@@ -17,11 +17,14 @@ limitations under the License. */
 namespace paddle {
 namespace operators {
 
+using framework::OpKernelType;
 using framework::Tensor;
 
-class MulOpShapeInference : public framework::InferShapeBase {
+class MulOp : public framework::OperatorWithKernel {
  public:
-  void operator()(framework::InferShapeContext* ctx) const override {
+  using framework::OperatorWithKernel::OperatorWithKernel;
+
+  void InferShape(framework::InferShapeContext* ctx) const override {
     PADDLE_ENFORCE(ctx->HasInput("X"), "Input(X) of MulOp should not be null.");
     PADDLE_ENFORCE(ctx->HasInput("Y"), "Input(Y) of MulOp should not be null.");
     PADDLE_ENFORCE(ctx->HasOutput("Out"),
@@ -122,7 +125,7 @@ or not. But the output only shares the LoD information with input $X$.
   }
 };
 
-class MulOpGrad : public framework::OperatorWithKernel {
+class MulGradOp : public framework::OperatorWithKernel {
  public:
   using framework::OperatorWithKernel::OperatorWithKernel;
 
@@ -156,10 +159,7 @@ class MulOpGrad : public framework::OperatorWithKernel {
 }  // namespace paddle
 
 namespace ops = paddle::operators;
-REGISTER_OPERATOR(mul, paddle::framework::OperatorWithKernel, ops::MulOpMaker,
-                  ops::MulOpShapeInference,
-                  paddle::framework::DefaultGradOpDescMaker<true>);
-REGISTER_OPERATOR(mul_grad, ops::MulOpGrad);
+REGISTER_OP(mul, ops::MulOp, ops::MulOpMaker, mul_grad, ops::MulGradOp);
 REGISTER_OP_CPU_KERNEL(
     mul, ops::MulKernel<paddle::platform::CPUDeviceContext, float>);
 REGISTER_OP_CPU_KERNEL(

paddle/fluid/operators/mul_op.cu.cc

@@ -13,9 +13,11 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #include "paddle/fluid/operators/mul_op.h"
+#include "paddle/fluid/platform/float16.h"
 
 namespace ops = paddle::operators;
-REGISTER_OP_CUDA_KERNEL(
-    mul, ops::MulKernel<paddle::platform::CUDADeviceContext, float>);
-REGISTER_OP_CUDA_KERNEL(
-    mul_grad, ops::MulGradKernel<paddle::platform::CUDADeviceContext, float>);
+namespace plat = paddle::platform;
+REGISTER_OP_CUDA_KERNEL(mul, ops::MulKernel<plat::CUDADeviceContext, float>,
+                        ops::MulKernel<plat::CUDADeviceContext, plat::float16>);
+REGISTER_OP_CUDA_KERNEL(mul_grad,
+                        ops::MulGradKernel<plat::CUDADeviceContext, float>);

paddle/fluid/operators/mul_op.h

@@ -48,7 +48,7 @@ class MulKernel : public framework::OpKernel<T> {
     }
     math::matmul<DeviceContext, T>(
         context.template device_context<DeviceContext>(), x_matrix, false,
-        y_matrix, false, 1, z, 0);
+        y_matrix, false, static_cast<T>(1), z, static_cast<T>(0));
     if (z_dim.size() != 2) {
       z->Resize(z_dim);
     }

paddle/fluid/pybind/pybind.cc

@@ -31,6 +31,7 @@ limitations under the License. */
 #include "paddle/fluid/operators/cond_op.h"
 #include "paddle/fluid/operators/net_op.h"
 #include "paddle/fluid/platform/enforce.h"
+#include "paddle/fluid/platform/gpu_info.h"
 #include "paddle/fluid/platform/place.h"
 #include "paddle/fluid/platform/profiler.h"
 #include "paddle/fluid/pybind/const_value.h"
@@ -103,12 +104,14 @@ PYBIND11_PLUGIN(core) {
       .def("set", PyCPUTensorSetFromArray<double>)
       .def("set", PyCPUTensorSetFromArray<int64_t>)
       .def("set", PyCPUTensorSetFromArray<bool>)
+      .def("set", PyCPUTensorSetFromArray<uint16_t>)
 #ifdef PADDLE_WITH_CUDA
       .def("set", PyCUDATensorSetFromArray<float>)
       .def("set", PyCUDATensorSetFromArray<int>)
       .def("set", PyCUDATensorSetFromArray<double>)
       .def("set", PyCUDATensorSetFromArray<int64_t>)
       .def("set", PyCUDATensorSetFromArray<bool>)
+      .def("set", PyCUDATensorSetFromArray<uint16_t>)
 #endif
       .def("shape", [](Tensor &self) { return vectorize(self.dims()); })
       .def("set_float_element", TensorSetElement<float>)
@@ -315,7 +318,6 @@ All parameter, weight, gradient are variables in Paddle.
 #endif
                   });
 // clang-format on
-
 #ifdef PADDLE_WITH_CUDA
   py::class_<platform::Communicator>(m, "Communicator").def(py::init<>());
 #endif
@@ -423,6 +425,12 @@ All parameter, weight, gradient are variables in Paddle.
   m.def("init_devices", &framework::InitDevices);
 
   m.def("is_compiled_with_cuda", IsCompiledWithCUDA);
+#ifdef PADDLE_WITH_CUDA
+  m.def("is_float16_supported", [](const platform::CUDAPlace &place) -> bool {
+    // Only GPUs with Compute Capability >= 53 support float16
+    return platform::GetCUDAComputeCapability(place.device) >= 53;
+  });
+#endif
 
   m.def("set_feed_variable", framework::SetFeedVariable);
   m.def("get_fetch_variable", framework::GetFetchVariable);

paddle/fluid/pybind/tensor_py.h

@@ -17,6 +17,7 @@ limitations under the License. */
 #include "paddle/fluid/framework/lod_tensor.h"
 #include "paddle/fluid/memory/memcpy.h"
 #include "paddle/fluid/platform/device_context.h"
+#include "paddle/fluid/platform/float16.h"
 #include "pybind11/numpy.h"
 #include "pybind11/pybind11.h"
 
@@ -77,21 +78,32 @@ struct CastToPyBufferImpl<true, I, ARGS...> {
       } else if (paddle::platform::is_cpu_place(tensor.place())) {
         dst_tensor = tensor;
       }
+
+      if (std::type_index(typeid(CUR_TYPE)) ==
+          std::type_index(typeid(platform::float16))) {
+        return py::buffer_info(dst_tensor.data<CUR_TYPE>(), sizeof(CUR_TYPE),
+                               "e", /* np.dtype('e') == np.float16 */
+                               (size_t)framework::arity(dst_tensor.dims()),
+                               dims_outside, strides);
+      } else {
         return py::buffer_info(dst_tensor.data<CUR_TYPE>(), sizeof(CUR_TYPE),
                                py::format_descriptor<CUR_TYPE>::format(),
                                (size_t)framework::arity(dst_tensor.dims()),
                                dims_outside, strides);
+      }
     } else {
       constexpr bool less = I + 1 < std::tuple_size<std::tuple<ARGS...>>::value;
       return CastToPyBufferImpl<less, I + 1, ARGS...>()(tensor);
     }
   }
 };
+
 }  // namespace details
+
 inline py::buffer_info CastToPyBuffer(framework::Tensor &tensor) {
   auto buffer_info =
-      details::CastToPyBufferImpl<true, 0, float, int, double, int64_t, bool>()(
-          tensor);
+      details::CastToPyBufferImpl<true, 0, float, int, double, int64_t, bool,
+                                  platform::float16>()(tensor);
   return buffer_info;
 }
 
@@ -136,6 +148,22 @@ void PyCPUTensorSetFromArray(
   std::memcpy(dst, array.data(), sizeof(T) * array.size());
 }
 
+template <>
+void PyCPUTensorSetFromArray(
+    framework::Tensor &self,
+    py::array_t<uint16_t, py::array::c_style | py::array::forcecast> array,
+    paddle::platform::CPUPlace &place) {
+  std::vector<int64_t> dims;
+  dims.reserve(array.ndim());
+  for (size_t i = 0; i < array.ndim(); ++i) {
+    dims.push_back((int)array.shape()[i]);
+  }
+
+  self.Resize(framework::make_ddim(dims));
+  auto *dst = self.mutable_data<platform::float16>(place);
+  std::memcpy(dst, array.data(), sizeof(uint16_t) * array.size());
+}
+
 #ifdef PADDLE_WITH_CUDA
 template <typename T>
 void PyCUDATensorSetFromArray(
@@ -157,6 +185,28 @@ void PyCUDATensorSetFromArray(
   paddle::platform::GpuMemcpyAsync(dst, array.data(), sizeof(T) * array.size(),
                                    cudaMemcpyHostToDevice, dev_ctx->stream());
 }
+
+template <>
+void PyCUDATensorSetFromArray(
+    framework::Tensor &self,
+    py::array_t<uint16_t, py::array::c_style | py::array::forcecast> array,
+    paddle::platform::CUDAPlace &place) {
+  std::vector<int64_t> dims;
+  dims.reserve(array.ndim());
+  for (size_t i = 0; i < array.ndim(); ++i) {
+    dims.push_back((int)array.shape()[i]);
+  }
+
+  self.Resize(framework::make_ddim(dims));
+  auto *dst = self.mutable_data<platform::float16>(place);
+
+  platform::DeviceContextPool &pool = platform::DeviceContextPool::Instance();
+  auto dev_ctx =
+      static_cast<const platform::CUDADeviceContext *>(pool.Get(place));
+  paddle::platform::GpuMemcpyAsync(dst, array.data(),
+                                   sizeof(uint16_t) * array.size(),
+                                   cudaMemcpyHostToDevice, dev_ctx->stream());
+}
 #endif
 
 }  // namespace pybind

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

@@ -14,6 +14,7 @@
 
 import unittest
 import numpy as np
+import paddle.fluid.core as core
 from op_test import OpTest
 
 
@@ -69,5 +70,42 @@ class TestMulOp2(OpTest):
             ['X'], 'Out', max_relative_error=0.5, no_grad_set=set('Y'))
 
 
+class TestFP16MulOp1(OpTest):
+    def setUp(self):
+        self.op_type = "mul"
+        x = np.random.random((32, 84)).astype("float16")
+        y = np.random.random((84, 100)).astype("float16")
+        self.inputs = {'X': x.view(np.uint16), 'Y': y.view(np.uint16)}
+        self.outputs = {'Out': np.dot(x, y)}
+
+    def test_check_output(self):
+        if core.is_compiled_with_cuda():
+            place = core.CUDAPlace(0)
+            if core.is_float16_supported(place):
+                self.check_output_with_place(place, atol=1e-1)
+
+
+class TestFP16MulOp2(OpTest):
+    def setUp(self):
+        self.op_type = "mul"
+        x = np.random.random((15, 4, 12, 10)).astype("float16")
+        y = np.random.random((4, 30, 8, 2, 9)).astype("float16")
+        self.inputs = {'X': x.view(np.uint16), 'Y': y.view(np.uint16)}
+        self.attrs = {
+            'x_num_col_dims': 2,
+            'y_num_col_dims': 2,
+        }
+        result = np.dot(
+            x.reshape(15 * 4, 12 * 10), y.reshape(4 * 30, 8 * 2 * 9))
+        result = result.reshape(15, 4, 8, 2, 9)
+        self.outputs = {'Out': result}
+
+    def test_check_output(self):
+        if core.is_compiled_with_cuda():
+            place = core.CUDAPlace(0)
+            if core.is_float16_supported(place):
+                self.check_output_with_place(place, atol=2e-1)
+
+
 if __name__ == "__main__":
     unittest.main()