[Dy2stat]Add naming rule if not specific InputSpec.name

[Aurelius84]

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New features

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Describe

Add naming rule if not specific InputSpec.name.

Naming rule

1. Already specific name

If InputSpec.name is not None, do nothing.

2. Single argument single InputSpec

If each argument x corresponds to an InputSpec, using the argument name like x

def foo(x, y):
    return x + y

foo = to_static(foo, input_spec=[InputSpec([None, 10]), InputSpec([None])])
print([in_var.name for in_var in foo.inputs])  # [x, y]

3. Argument with list

If the arguments inputs corresponds to a list(InputSpec), using name like inputs_0, inputs_1

def foo(inputs):
    return inputs[0] + inputs[1]

foo = to_static(foo, input_spec=[[InputSpec([None, 10]), InputSpec([None])]])
print([in_var.name for in_var in foo.inputs])  # [inputs_0, inputs_1]

4. Argument with dict

If the arguments input_dic corresponds to a dict(InputSpec), using key as name.

def foo(inputs):
    return inputs['x'] + inputs['y']

 foo = to_static(foo, input_spec=[{'x': InputSpec([None, 10]), 'y': InputSpec([None])}])
print([in_var.name for in_var in foo.inputs])  # [x, y]

[paddle-bot-old]

Thanks for your contribution!
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[zhhsplendid]

LGTM

[zhhsplendid]

Tiny English grammar issue:

"The naming rule is" or "The naming rules are".

[chenwhql]

LGTM