Add fill_op (#6477)

* Add fill_op

* Fix bug

paddle/operators/fill_op.cc

+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License. */
+
+#include "paddle/framework/data_type.h"
+#include "paddle/framework/op_registry.h"
+#include "paddle/operators/detail/safe_ref.h"
+
+namespace paddle {
+namespace operators {
+
+struct FillOpVisitor {
+  FillOpVisitor(framework::LoDTensor *tensor, const std::vector<float> &value)
+      : tensor_(tensor), value_(value) {}
+
+  template <typename T>
+  void operator()() const {
+    platform::CPUPlace cpu;
+    auto *data = tensor_->mutable_data<T>(cpu);
+    std::transform(value_.data(), value_.data() + tensor_->numel(), data,
+                   [](float dat) { return static_cast<T>(dat); });
+  }
+
+  framework::LoDTensor *tensor_;
+  const std::vector<float> &value_;
+};
+
+class FillOp : public framework::OperatorBase {
+ public:
+  FillOp(const std::string &type, const framework::VariableNameMap &inputs,
+         const framework::VariableNameMap &outputs,
+         const framework::AttributeMap &attrs)
+      : OperatorBase(type, inputs, outputs, attrs) {}
+  void Run(const framework::Scope &scope,
+           const platform::DeviceContext &dev_ctx) const override {
+    auto &out =
+        detail::Ref(detail::Ref(scope.FindVar(Output("Out")),
+                                "Cannot find variable %s", Output("Out"))
+                        .GetMutable<framework::LoDTensor>());
+    out.Resize(framework::make_ddim(Attr<std::vector<int>>("shape")));
+    auto dtype = static_cast<framework::DataType>(Attr<int>("dtype"));
+    platform::CPUPlace cpu;
+    auto force_cpu = Attr<bool>("force_cpu");
+    out.mutable_data(force_cpu ? cpu : dev_ctx.GetPlace(),
+                     framework::ToTypeIndex(dtype));
+
+    framework::LoDTensor tensor;
+
+    if (force_cpu || platform::is_cpu_place(dev_ctx.GetPlace())) {
+      tensor.ShareDataWith(out);
+    } else {
+      // Always make tensor in CPU memory.
+      tensor.Resize(out.dims());
+      tensor.mutable_data(cpu, framework::ToTypeIndex(dtype));
+    }
+
+    framework::VisitDataType(
+        dtype, FillOpVisitor(&tensor, Attr<std::vector<float>>("value")));
+
+    if (!force_cpu && platform::is_gpu_place(dev_ctx.GetPlace())) {
+      // Copy tensor to out
+      framework::CopyFrom(tensor, dev_ctx.GetPlace(), dev_ctx, &out);
+    }
+  }
+};
+
+class FillOpMaker : public framework::OpProtoAndCheckerMaker {
+ public:
+  FillOpMaker(framework::OpProto *proto, framework::OpAttrChecker *op_checker)
+      : OpProtoAndCheckerMaker(proto, op_checker) {
+    AddComment(R"DOC(Fill operator
+
+Fill an tensor with `value` and `shape`. The type of the tensor is specify by
+`dtype`.
+)DOC");
+    AddOutput("Out", "(LoDTensor) The output tensor.");
+    AddAttr<std::vector<float>>(
+        "value", "The float values of tensor, which are flatten in row major");
+    AddAttr<std::vector<int>>("shape", "The shape of output tensor");
+    AddAttr<int>("dtype", "The data type of output tensor, Default is float")
+        .SetDefault(framework::DataType::FP32);
+    AddAttr<bool>("force_cpu",
+                  "Whether the output tensor must be at CPU memory or not. "
+                  "Default is false.")
+        .SetDefault(false);
+  }
+};
+
+class FillOpInferShape : public framework::InferShapeBase {
+ public:
+  void operator()(framework::InferShapeContext *context) const override {
+    context->SetOutputDim(
+        "Out",
+        framework::make_ddim(context->Attrs().Get<std::vector<int>>("shape")));
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
+namespace ops = paddle::operators;
+REGISTER_OPERATOR(fill, ops::FillOp, ops::FillOpInferShape, ops::FillOpMaker);

python/paddle/v2/fluid/tests/test_fill_op.py

+import unittest
+import numpy as np
+from op_test import OpTest
+import paddle.v2.fluid.core as core
+
+
+class TestFillOp(OpTest):
+    def setUp(self):
+        self.op_type = "fill"
+        val = np.random.random(size=[100, 200])
+        self.inputs = {}
+        self.attrs = {
+            'value': val.flatten().tolist(),
+            'shape': [100, 200],
+            'dtype': int(core.DataType.FP64)
+        }
+        self.outputs = {'Out': val.astype('float64')}
+
+    def test_check_output(self):
+        self.check_output()
+
+
+if __name__ == '__main__':
+    unittest.main()