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86 lines
3.0 KiB
86 lines
3.0 KiB
/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License. */
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#include "paddle/fluid/framework/op_registry.h"
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#include "paddle/fluid/framework/operator.h"
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namespace paddle {
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namespace framework {
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class InferShapeContext;
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class OpDesc;
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class Scope;
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template <typename T>
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class EmptyGradOpMaker;
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} // namespace framework
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namespace imperative {
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class OpBase;
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} // namespace imperative
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} // namespace paddle
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namespace paddle {
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namespace operators {
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class MaxSeqenceLenOp : public framework::OperatorBase {
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public:
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MaxSeqenceLenOp(const std::string &type,
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const framework::VariableNameMap &inputs,
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const framework::VariableNameMap &outputs,
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const framework::AttributeMap &attrs)
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: OperatorBase(type, inputs, outputs, attrs) {}
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private:
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void RunImpl(const framework::Scope &scope,
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const platform::Place &dev_place) const override {
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auto &rank_table =
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scope.FindVar(Input("RankTable"))->Get<framework::LoDRankTable>();
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auto *out =
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scope.FindVar(Output("Out"))->GetMutable<framework::LoDTensor>();
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int64_t *out_ptr = out->mutable_data<int64_t>({1}, platform::CPUPlace());
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*out_ptr = rank_table.items()[0].length;
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}
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};
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class MaxSeqenceLenOpProtoMaker : public framework::OpProtoAndCheckerMaker {
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public:
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void Make() override {
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AddInput("RankTable", "Input variable which is a LoDRankTable object");
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AddOutput("Out", "The max sequence length");
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AddComment(R"DOC(
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Given a LoDRankTable object, this layer returns the max length of
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a batch of sequences. In fact, a LoDRankTable object contains a list of
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tuples(<sequence index, sequence length>) and the list is already sorted by
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sequence length in descending order, so the operator just returns the
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sequence length of the first tuple element
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)DOC");
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}
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};
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class MaxSeqenceLenInferShape : public framework::InferShapeBase {
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public:
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void operator()(framework::InferShapeContext *context) const override {
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OP_INOUT_CHECK(context->HasInput("RankTable"), "Input", "RankTable",
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"MaxSeqenceLen");
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context->SetOutputDim("Out", {1});
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}
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};
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} // namespace operators
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} // namespace paddle
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REGISTER_OPERATOR(
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max_sequence_len, paddle::operators::MaxSeqenceLenOp,
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paddle::operators::MaxSeqenceLenOpProtoMaker,
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paddle::operators::MaxSeqenceLenInferShape,
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paddle::framework::EmptyGradOpMaker<paddle::framework::OpDesc>,
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paddle::framework::EmptyGradOpMaker<paddle::imperative::OpBase>);
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