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/* Copyright 2016 The TensorFlow 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.
==============================================================================*/
#ifndef TENSORFLOW_CONTRIB_FRAMEWORK_KERNELS_ZERO_INITIALIZER_OP_H_
#define TENSORFLOW_CONTRIB_FRAMEWORK_KERNELS_ZERO_INITIALIZER_OP_H_
#include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor"
#include "tensorflow/core/framework/op_kernel.h"
namespace tensorflow {
template <typename T>
class ZeroInitializerOp : public OpKernel {
public:
explicit ZeroInitializerOp(OpKernelConstruction* ctx) : OpKernel(ctx) {
OP_REQUIRES(ctx, IsRefType(ctx->input_type(0)),
errors::InvalidArgument("input needs to be a ref type"));
}
void Compute(OpKernelContext* ctx) override {
mutex_lock l(*ctx->input_ref_mutex(0));
Tensor input = ctx->mutable_input(0, true);
OP_REQUIRES(ctx, !input.IsInitialized(),
errors::InvalidArgument("input is already initialized"));
AllocatorAttributes attr;
attr.set_gpu_compatible(true);
attr.set_nic_compatible(true);
PersistentTensor out_persistent;
Tensor* out_tensor = nullptr;
OP_REQUIRES_OK(ctx, ctx->allocate_persistent(
input.dtype(), input.shape(), &out_persistent,
&out_tensor, attr));
auto out_tensor_flat = out_tensor->flat<T>();
int total_size = static_cast<int>(1);
for (int d = static_cast<int>(0); d < out_tensor->dims(); d++) {
total_size *= out_tensor->dim_size(d);
}
for (int idx = static_cast<int>(0); idx < total_size; idx++) {
out_tensor_flat(idx) = static_cast<T>(0);
}
ctx->replace_ref_input(0, *out_tensor, true);
// we always return the input ref.
ctx->forward_ref_input_to_ref_output(0, 0);
}
};
} // end namespace tensorflow
#endif // TENSORFLOW_CONTRIB_FRAMEWORK_KERNELS_ZERO_INITIALIZER_OP_H_
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