Implement clpy.backend.is_available()

[LWisteria]

clpy/clpy/backend/__init__.py

Lines 37 to 50 in a60ed24

	# TODO(tomoharu.kitawaki) use getDeviceCount which is implemented in OpenCL
	'''
	def is_available():
	global _available
	if _available is None:
	_available = False
	try:
	_available = runtime.getDeviceCount() > 0
	except Exception as e:
	if (e.args[0] !=
	'cudaErrorNoDevice: no CUDA-capable device is detected'):
	raise
	return _available
	'''