private static Set<IndexMappingBuffer> getAllMappings(MappingsPort opu) {
Set<IndexMappingBuffer> res = new HashSet<>();
IndexMappingBuffer c;
while ((c = opu.take()) != null) res.add(c);
return res;
}
/**
* Returns {@code true} if there is positive mapping of tensor {@code from} on tensor {@code to}.
*
* @param from from tensor
* @param to to tensor
* @return {@code true} if there is positivemapping of tensor {@code from} on tensor {@code to}
*/
public static boolean positiveMappingExists(Tensor from, Tensor to) {
IndexMappingBuffer buffer;
MappingsPort port = createPort(from, to);
while ((buffer = port.take()) != null) if (!buffer.getSign()) return true;
return false;
}