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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.tensor;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* Takes the difference between two tensors, see {@link Tensor#subtract}
*
* @author bratseth
*/
class TensorDifference {
private final Set<String> dimensions;
private final Map<TensorAddress, Double> cells = new HashMap<>();
public TensorDifference(Tensor a, Tensor b) {
this.dimensions = TensorOperations.combineDimensions(a, b);
cells.putAll(a.cells());
for (Map.Entry<TensorAddress, Double> bCell : b.cells().entrySet())
cells.put(bCell.getKey(), a.cells().getOrDefault(bCell.getKey(), 0d) - bCell.getValue());
}
/** Returns the result of taking this sum */
public Tensor result() {
return new MapTensor(dimensions, cells);
}
}
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