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/*******************************************************************************
* 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.shape;
import lombok.val;
import onnx.OnnxProto3;
import org.nd4j.autodiff.samediff.SDVariable;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.base.Preconditions;
import org.nd4j.imports.descriptors.properties.PropertyMapping;
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.api.shape.LongShapeDescriptor;
import org.nd4j.linalg.exception.ND4JIllegalStateException;
import org.nd4j.linalg.util.ArrayUtil;
import org.tensorflow.framework.AttrValue;
import org.tensorflow.framework.GraphDef;
import org.tensorflow.framework.NodeDef;
import java.util.*;
/**
* Unstack op conversion
*
* @author [email protected]
*/
public class Unstack extends DynamicCustomOp {
// TODO: libnd4j currently doesn't support "num", number of outputs is inferred.
private int num = -1;
private int jaxis;
public Unstack() {
}
public Unstack(SameDiff sameDiff, SDVariable value, int axis) {
super(null, sameDiff, new SDVariable[]{value}, false);
this.jaxis = axis;
if (value.getShape() != null){
if (value.getShape()[axis] != -1){
num = (int)value.getShape()[axis];
}
}
if (num <= 0){
throw new ND4JIllegalStateException("Unstack: Unable to infer number of outputs from input. Provide number of outputs explicitly.");
}
addArgs();
}
public Unstack(SameDiff sameDiff, SDVariable value, int axis, int num) {
super(null, sameDiff, new SDVariable[]{value}, false);
this.jaxis = axis;
this.num = num;
addArgs();
}
public Unstack(INDArray in, INDArray[] out, int axis){
super(null, new INDArray[]{in}, out, null, (int[])null);
this.jaxis = axis;
addArgs();
}
public void addArgs() {
addIArgument(jaxis);
}
@Override
public String[] tensorflowNames() {
return new String[]{"Unstack", "Unpack"};
}
@Override
public String tensorflowName() {
return "Unstack";
}
@Override
public String opName() {
return "unstack";
}
@Override
public void initFromTensorFlow(NodeDef nodeDef, SameDiff initWith, Map attributesForNode, GraphDef graph) {
val attrAxis = nodeDef.getAttrOrThrow("axis");
int axis = (int) attrAxis.getI();
this.jaxis = axis;
val attrNum = nodeDef.getAttrOrDefault("num", null);
if(attrNum != null){
this.num = (int) attrNum.getI();
}
addArgs();
}
@Override
public Map> mappingsForFunction() {
Map> ret = new HashMap<>();
Map map = new HashMap<>();
val axisMapping = PropertyMapping.builder()
.onnxAttrName("axis")
.tfInputPosition(-1)
.propertyNames(new String[]{"axis"})
.build();
map.put("axis", axisMapping);
ret.put(tensorflowName(), map);
return ret;
}
@Override
public void initFromOnnx(OnnxProto3.NodeProto node, SameDiff initWith, Map attributesForNode, OnnxProto3.GraphProto graph) {
throw new UnsupportedOperationException("No analog found for onnx for " + opName());
}
@Override
public int getNumOutputs(){
return num;
}
@Override
public List doDiff(List f1) {
return Collections.singletonList(sameDiff.stack(jaxis, f1.toArray(new SDVariable[f1.size()])));
}
@Override
public List calculateOutputDataTypes(List dataTypes){
Preconditions.checkState(dataTypes.size() == 1, "Expected list with exactly 1 datatype for %s, got %s", getClass(), dataTypes);
//Output types are same as input type - i.e., just unpack rank R array into N rank R-1 arrays
List out = new ArrayList<>();
for( int i=0; i calculateOutputShape(){
//TEMPORARY workaround for: https://github.com/deeplearning4j/deeplearning4j/issues/7093
if(inputArguments.size() == 1 && inputArguments.get(0).rank() == 1){
INDArray arr = inputArguments.get(0);
Preconditions.checkState(jaxis == 0, "Can only unstack along dimension 0 for rank 1 arrays, got axis %s for array %ndShape", jaxis, arr);
LongShapeDescriptor lsd = LongShapeDescriptor.fromShape(new long[0], arr.dataType());
List out = Arrays.asList(ArrayUtil.nTimes((int)arr.length(), lsd, LongShapeDescriptor.class));
return out;
}
return super.calculateOutputShape();
}
}