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114 lines
4.0 KiB
114 lines
4.0 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/operators/hinge_loss_op.h"
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namespace paddle {
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namespace operators {
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class HingeLossOp : public framework::OperatorWithKernel {
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public:
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using framework::OperatorWithKernel::OperatorWithKernel;
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void InferShape(framework::InferShapeContext* ctx) const override {
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PADDLE_ENFORCE(ctx->HasInput("Logits"),
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"Input(Logits) must be initialized.");
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PADDLE_ENFORCE(ctx->HasInput("Labels"),
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"Input(Labels) must be initialized.");
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auto pred_dims = ctx->GetInputDim("Logits");
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auto label_dims = ctx->GetInputDim("Labels");
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PADDLE_ENFORCE_EQ(pred_dims, label_dims);
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PADDLE_ENFORCE_EQ(pred_dims.size(), 2,
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"The rank of Input(Logits) must be 2 and the shape is "
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"[batch_size, 1].");
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PADDLE_ENFORCE_EQ(pred_dims[1], 1,
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"Each row of Input(Logits) contains a real value, "
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"so the 2nd dimension of Input(Logits) must be 1.");
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ctx->SetOutputDim("Loss", {pred_dims[0], 1});
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ctx->ShareLoD("Logits", "Loss");
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}
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};
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template <typename AttrType>
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class HingeLossOpMaker : public framework::OpProtoAndCheckerMaker {
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public:
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HingeLossOpMaker(OpProto* proto, OpAttrChecker* op_checker)
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: OpProtoAndCheckerMaker(proto, op_checker) {
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AddInput("Logits",
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"The input value (Logits) of Hinge loss op."
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"Logits is a 2-D tensor with shape [batch_size, 1].");
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AddInput("Labels",
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"The target value (Labels) of Hinge loss op."
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"Labels is a 2-D tensor with shape [batch_size, 1].");
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AddOutput("Loss",
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"The output tensor with shape [batch_size, 1] "
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"which represents the hinge loss.");
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AddComment(R"DOC(
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HingeLoss Operator.
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Let x be a logit (prediction) and y be the actual label. The logit can
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take any values from (-inf, inf), but the labels should be either -1 or 1.
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Then, the hinge loss is computed as follows:
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$$
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L_(x, y) = max(1 - y.x, 0)
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$$
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Note that the labels passed as input will have values as either 0 or 1.
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)DOC");
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}
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};
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class HingeLossGradOp : public framework::OperatorWithKernel {
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public:
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using framework::OperatorWithKernel::OperatorWithKernel;
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void InferShape(framework::InferShapeContext* ctx) const override {
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PADDLE_ENFORCE(ctx->HasInput("Logits"),
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"Input(Logits) should not be null.");
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PADDLE_ENFORCE(ctx->HasInput("Labels"),
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"Input(Labels) should not be null.");
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PADDLE_ENFORCE(ctx->HasInput(framework::GradVarName("Loss")),
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"Input(Loss@GRAD) should not be null.");
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PADDLE_ENFORCE(ctx->HasOutput(framework::GradVarName("Logits")),
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"Input(Logits@GRAD) should not be null.");
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auto pred_dims = ctx->GetInputDim("Logits");
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auto lab_dims = ctx->GetInputDim("Labels");
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auto loss_grad_dims = ctx->GetInputDim(framework::GradVarName("Loss"));
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PADDLE_ENFORCE_EQ(loss_grad_dims, pred_dims);
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auto pred_grad_name = framework::GradVarName("Logits");
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ctx->SetOutputDim(pred_grad_name, pred_dims);
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}
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};
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} // namespace operators
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} // namespace paddle
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namespace ops = paddle::operators;
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REGISTER_OP(hinge_loss, ops::HingeLossOp, ops::HingeLossOpMaker<float>,
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hinge_loss_grad, ops::HingeLossGradOp);
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REGISTER_OP_CPU_KERNEL(
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hinge_loss,
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ops::HingeLossKernel<paddle::platform::CPUDeviceContext, float>);
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REGISTER_OP_CPU_KERNEL(
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hinge_loss_grad,
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ops::HingeLossGradKernel<paddle::platform::CPUDeviceContext, float>);
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