Retrieves a Parameter with name self.prefix+name. If not found,
get() will first try to retrieve it from “shared” dict. If still not
found, get() will create a new Parameter with key-word arguments and
insert it to self.
Parameters
name (str) – Name of the desired Parameter. It will be prepended with this dictionary’s
prefix.
**kwargs (dict) – The rest of key-word arguments for the created Parameter.
