def CreateGradientForOp(cls, forward_op, g_output):
"""Generate the OperatorDef for ``BackwardOp`` by ``ForwardOp``.
Parameters
----------
forward_op : dragon_pb2.OperatorDef
The OperatorDef of ``ForwardOp``.
g_output : list of str
The inputs of ``BackwardOp`` (Precomputed Grads).
Returns
-------
tuple
The OpDef, outputs and defaults of ``BackwardOp``.
References
----------
The wrapper of ``CreateGradientDefsCC``.
"""
g_ops, g_inputs, defaults = \
CreateGradientDefsCC(forward_op.SerializeToString(), g_output)
for idx, g_op in enumerate(g_ops):
new_def = pb.OperatorDef()
new_def.ParseFromString(g_op)
_, new_def.name = GetOperatorName()
g_ops[idx] = new_def
return g_ops, g_inputs, defaults
def MakeOperatorDef(op_type,
inputs,
outputs,
name='',
device_option=None,
arg=None,
engine=None,
**kwargs):
operator = pb.OperatorDef()
operator.type = op_type
operator.name = name
operator.input.extend([str(tensor) for tensor in inputs])
operator.output.extend([str(tensor) for tensor in outputs])
if device_option is not None:
operator.device_option.CopyFrom(device_option)
if engine is not None:
operator.engine = engine
if 'random_seed' in kwargs:
operator.device_option.random_seed = kwargs['random_seed']
del kwargs['random_seed']
if arg is not None:
operator.arg.extend(arg)
for k, v in kwargs.items():
if v is None: continue
operator.arg.add().CopyFrom(MakeArgument(k, v))
return operator
def MutableOperatorDef(meta_def, inputs, outputs):
op = pb.OperatorDef()
op.CopyFrom(meta_def)
op.ClearField('input')
op.input.extend(inputs)
op.ClearField('output')
op.output.extend(outputs)
return op
def CreateGradientForOp(cls, op_def, g_output):
""" parse ops from string """
g_ops, g_inputs, defaults = CreateGradientDefsCC(
op_def.SerializeToString(), g_output)
for idx, g_op in enumerate(g_ops):
new_def = pb.OperatorDef()
new_def.ParseFromString(g_op)
_, new_def.name = GetOperatorName()
g_ops[idx] = new_def
return g_ops, g_inputs, defaults
def CreateGradientForOp(cls, op_def, g_output):
""" parse ops from string """
g_ops, g_inputs, defaults = CreateGradientDefsCC(
op_def.SerializeToString(), g_output)
if sys.version_info >= (3, 0):
g_inputs = [g_input.decode('ascii') for g_input in g_inputs]
for idx, g_op in enumerate(g_ops):
new_def = pb.OperatorDef()
new_def.ParseFromString(g_op)
_, new_def.name = GetOperatorName()
g_ops[idx] = new_def
return g_ops, g_inputs, defaults
