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41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
# Copyright (c) 2013, GPy authors (see AUTHORS.txt).
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# Licensed under the BSD 3-clause license (see LICENSE.txt)
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import numpy as np
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from ..core.mapping import Mapping
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import GPy
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class Additive(Mapping):
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"""
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Mapping based on adding two existing mappings together.
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.. math::
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f(\mathbf{x}*) = f_1(\mathbf{x}*) + f_2(\mathbf(x)*)
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:param mapping1: first mapping to add together.
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:type mapping1: GPy.mappings.Mapping
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:param mapping2: second mapping to add together.
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:type mapping2: GPy.mappings.Mapping
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"""
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def __init__(self, mapping1, mapping2):
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assert(mapping1.input_dim==mapping2.input_dim)
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assert(mapping1.output_dim==mapping2.output_dim)
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input_dim, output_dim = mapping1.input_dim, mapping1.output_dim
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Mapping.__init__(self, input_dim=input_dim, output_dim=output_dim)
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self.mapping1 = mapping1
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self.mapping2 = mapping2
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self.num_params = self.mapping1.num_params + self.mapping2.num_params
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self.name = self.mapping1.name + '+' + self.mapping2.name
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def f(self, X):
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return self.mapping1.f(X) + self.mapping2.f(X)
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def update_gradients(self, dL_dF, X):
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self.mapping1.update_gradients(dL_dF, X)
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self.mapping2.update_gradients(dL_dF, X)
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def gradients_X(self, dL_dF, X):
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return self.mapping1.gradients_X(dL_dF, X) + self.mapping2.gradients_X(dL_dF, X)
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