public boolean isConvertibleTo(TensorType generalization) {
        return isConvertibleOrAssignableTo(generalization, true, true);
    }
Returns whether this type can be converted to the given type.
This is true if this type isAssignableTo the given type or
if it is not assignable only because it has a shorter dimension length
than the given type in some shared dimension(s), as it can then be
converted to the given type by zero padding.
vespajlib/src/main/java/com/yahoo/tensor/TensorType.java