50 lines
1.6 KiB
Go
50 lines
1.6 KiB
Go
/*
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Copyright 2016 The TensorFlow 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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*/
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package op
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import (
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"fmt"
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tf "github.com/tensorflow/tensorflow/tensorflow/go"
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)
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// Gradients adds gradients computation ops to the graph according to scope.
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//
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// Arguments:
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// y: output of the function to derive
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// x: inputs of the function for which partial derivatives are computed
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// dx: if not null, the partial derivatives of some loss function L w.r.t. y
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//
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// return the partial derivatives
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func Gradients(scope *Scope, y []tf.Output, x []tf.Output, dx ...tf.Output) (output []tf.Output) {
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if len(scope.controlDependencies) > 0 {
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scope.UpdateErr("Gradients", fmt.Errorf("Gradients does not currently support control dependencies (via Scope.WithControlDependencies)."))
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return
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}
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if scope.device != "" {
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scope.UpdateErr("Gradients", fmt.Errorf("Gradients does not currently support device annotations (via Scope.WithDevice)."))
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return
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}
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var err error
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if output, err = scope.graph.AddGradients(scope.opName("Gradients"), y, x, dx); err != nil {
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scope.UpdateErr("Gradients", err)
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return
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}
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return output
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}
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