@classmethod
def is_supported(cls):
    """ Returns True if this backend can be used.

			# Return value

			If the backend appears to be useable, returns True. Otherwise,
			returns False.

			Note that if this returns False, then the backend should definitely
			not be able to be used. However, just because it returns True
			doesn't mean it will work (e.g., Theano with `force_device=true`,
			but without the requested device installed).
		"""
    raise NotImplementedError
