在dynet中按名称调用参数

calling parameters by name in dynet

有没有办法在dynet中通过名称调用参数:

def dosomething(model):
    temp = model.get_parameter("temp") #something like this?
    ...

def create():
    Model = ParameterCollection()
    temp = Model.add_parameters((2,2))
    ...
    dosomething(Model) 

你不能直接这样做,使用 dynet API。

每个参数都有一个名称,您可以使用关键字参数 name 指定该名称。示例:

pW = model.add_parameter((12, 12), name="W")

然而 (source):

The names are used for identifying the parameters and the collection hierarchy when loading from disk, and in particular when loading only a subset of the objects in a saved file.

...

One can supply an optional informative name when creating the parameter or sub-collection. The supplied names are then appended with running index to avoid name clashes.

所以你不能根据 ParameterCollection 对象和名称检索相应的参数(好吧,你可以,但我不建议这样做)。


所以通常的做法是在需要时使用字典来实现:

import dynet as dy

def dosomething(model, params):
    pW = params["W"]
    pb = params["b"]
    #...

def create():
    model = dy.ParameterCollection()
    params = {}
    params["W"] = model.add_parameters((12, 12))
    params["b"] = model.add_parameters((12, ))

    #...
    dosomething(model, params)

create()