# Copyright (c) 2015, James Hensman
from ..core.mapping import Mapping
from ..core import Param
[docs]class Identity(Mapping):
"""
A mapping that does nothing!
"""
def __init__(self, input_dim, output_dim, name='identity'):
super(Identity, self).__init__(input_dim, output_dim, name)
[docs] def f(self, X):
return X
[docs] def update_gradients(self, dL_dF, X):
pass
[docs] def gradients_X(self, dL_dF, X):
return dL_dF
[docs] def to_dict(self):
"""
Convert the object into a json serializable dictionary.
Note: It uses the private method _save_to_input_dict of the parent.
:return dict: json serializable dictionary containing the needed information to instantiate the object
"""
input_dict = super(Identity, self)._save_to_input_dict()
input_dict["class"] = "GPy.mappings.Identity"
return input_dict