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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 min of each cell of two tensors, see {@link Tensor#min}
*
* @author bratseth
*/
class TensorMin {
private final Set<String> dimensions;
private final Map<TensorAddress, Double> cells = new HashMap<>();
public TensorMin(Tensor a, Tensor b) {
dimensions = TensorOperations.combineDimensions(a, b);
cells.putAll(a.cells());
for (Map.Entry<TensorAddress, Double> bCell : b.cells().entrySet()) {
Double aValue = a.cells().get(bCell.getKey());
if (aValue == null)
cells.put(bCell.getKey(), bCell.getValue());
else
cells.put(bCell.getKey(), Math.min(aValue, bCell.getValue()));
}
}
/** Returns the result of taking this sum */
public Tensor result() { return new MapTensor(dimensions, cells); }
}
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