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org.nd4j.linalg.api.ops.impl.image.ExtractImagePatches Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2015-2018 Skymind, Inc.
*
* This program and the accompanying materials are made available under the
* terms of the Apache License, Version 2.0 which is available at
* https://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.
*
* SPDX-License-Identifier: Apache-2.0
******************************************************************************/
package org.nd4j.linalg.api.ops.impl.image;
import lombok.NonNull;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.imports.graphmapper.tf.TFGraphMapper;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.api.ops.DynamicCustomOp;
import org.nd4j.linalg.factory.Nd4j;
import org.tensorflow.framework.AttrValue;
import org.tensorflow.framework.GraphDef;
import org.tensorflow.framework.NodeDef;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Extract image patches op - a sliding window operation over 4d activations that puts the
* output images patches into the depth dimension
*
* @author Alex Black
*/
public class ExtractImagePatches extends DynamicCustomOp {
private int[] kSizes;
private int[] strides;
private int[] rates;
private boolean isSameMode;
public ExtractImagePatches(){ }
public ExtractImagePatches(@NonNull SameDiff samediff, @NonNull SDVariable input, @NonNull int[] kSizes,
@NonNull int[] strides, @NonNull int[] rates, boolean sameMode){
super(samediff, input);
Preconditions.checkState(kSizes.length == 2, "Expected exactly 2 kernel sizes, got %s", kSizes);
Preconditions.checkState(strides.length == 2, "Expected exactly 2 strides, got %s", strides);
Preconditions.checkState(rates.length == 2, "Expected exactly 2 rate values, got %s", rates);
this.kSizes = kSizes;
this.strides = strides;
this.rates = rates;
this.isSameMode = sameMode;
addArgs();
}
public ExtractImagePatches(@NonNull INDArray input, @NonNull int[] kSizes,
@NonNull int[] strides, @NonNull int[] rates, boolean sameMode){
super(new INDArray[]{input}, null);
Preconditions.checkState(kSizes.length == 2, "Expected exactly 2 kernel sizes, got %s", kSizes);
Preconditions.checkState(strides.length == 2, "Expected exactly 2 strides, got %s", strides);
Preconditions.checkState(rates.length == 2, "Expected exactly 2 rate values, got %s", rates);
this.kSizes = kSizes;
this.strides = strides;
this.rates = rates;
this.isSameMode = sameMode;
addArgs();
}
@Override
public String opName() {
return "extract_image_patches";
}
@Override
public String tensorflowName() {
return "ExtractImagePatches";
}
@Override
public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
//TF includes redundant leading and training 1s for kSizes, strides, rates (positions 0/3)
kSizes = parseIntList(attributesForNode.get("ksizes").getList());
strides = parseIntList(attributesForNode.get("strides").getList());
rates = parseIntList(attributesForNode.get("rates").getList());
String s = attributesForNode.get("padding").getS().toStringUtf8();
isSameMode = s.equalsIgnoreCase("SAME");
addArgs();
}
protected void addArgs() {
iArguments.clear();
addIArgument(kSizes);
addIArgument(strides);
addIArgument(rates);
addIArgument(isSameMode ? 1 : 0);
addIArgument();
}
@Override
public List doDiff(List f1) {
throw new UnsupportedOperationException();
}
@Override
public int getNumOutputs(){
return 1;
}
private static int[] parseIntList(AttrValue.ListValue ilist){
//TF includes redundant leading and training 1s for kSizes, strides, rates (positions 0/3)
return new int[]{(int)ilist.getI(1), (int)ilist.getI(2)};
}
}