#ifndef CAFFE2_OPERATORS_REVERSE_PACKED_SEGS_OP_H_
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#define CAFFE2_OPERATORS_REVERSE_PACKED_SEGS_OP_H_
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#include "caffe2/core/context.h"
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#include "caffe2/core/operator.h"
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namespace caffe2 {
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template <class Context>
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class ReversePackedSegsOp final : public Operator<Context> {
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public:
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USE_OPERATOR_CONTEXT_FUNCTIONS;
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USE_SIMPLE_CTOR_DTOR(ReversePackedSegsOp);
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USE_DISPATCH_HELPER;
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bool RunOnDevice() override {
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return DispatchHelper<TensorTypes<float, double, int, long, bool>>::call(
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this, Input(DATA));
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}
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template <typename T>
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bool DoRunWithType() {
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if (Input(LENGTHS).template IsType<int>()) {
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DoRunWithLengthType<T, int>();
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} else {
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DoRunWithLengthType<T, long>();
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}
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return true;
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}
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private:
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INPUT_TAGS(DATA, LENGTHS);
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template <typename T, typename LengthType>
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void DoRunWithLengthType() {
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const auto& data = Input(DATA);
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const auto& lengths = Input(LENGTHS);
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CAFFE_ENFORCE(
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data.dim() == 3,
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"DATA should be 3-D tensor <lengths, "
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"segments, embeddings>");
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CAFFE_ENFORCE(lengths.dim() == 1, "LENGTH should be 1-D");
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const auto shape = data.sizes();
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auto* output = Output(0, shape, at::dtype<T>());
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const auto max_length = data.sizes()[0];
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const auto batch_size = data.sizes()[1];
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const auto block_size = data.sizes()[2];
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CAFFE_ENFORCE(
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lengths.sizes()[0] == batch_size,
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"lenths size should be"
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" equal to batch size");
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const T* data_ptr = data.template data<T>();
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const LengthType* lengths_ptr = lengths.template data<LengthType>();
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vector<LengthType> lengths_host(batch_size);
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context_.template CopyToCPU<LengthType>(
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batch_size, lengths_ptr, &lengths_host[0]);
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context_.FinishDeviceComputation();
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T* rev_data_ptr = output->template mutable_data<T>();
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for (int64_t i = 0; i < batch_size; i++) {
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const auto& seg_length = lengths_host[i];
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CAFFE_ENFORCE_LE(seg_length, max_length);
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int64_t j = 0;
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for (; j < seg_length; j++) {
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const T* data_block_ptr = data_ptr + (j * batch_size + i) * block_size;
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T* rev_data_block_ptr =
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rev_data_ptr + ((seg_length - 1 - j) * batch_size + i) * block_size;
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context_.template CopySameDevice<T>(
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block_size, data_block_ptr, rev_data_block_ptr);
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}
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for (; j < max_length; j++) {
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const T* data_block_ptr = data_ptr + (j * batch_size + i) * block_size;
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T* rev_data_block_ptr =
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rev_data_ptr + (j * batch_size + i) * block_size;
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context_.template CopySameDevice<T>(
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block_size, data_block_ptr, rev_data_block_ptr);
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}
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}
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}
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};
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} // namespace caffe2
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#endif // CAFFE2_OPERATORS_REVERSE_PACKED_SEGS_OP_H_
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