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Added notes to the zplus rule, referring to the original DTD paper, w… #8

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Feb 17, 2021
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Added notes to the zplus rule, referring to the original DTD paper, w… #8

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10 changes: 9 additions & 1 deletion zennit/rules.py
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,15 @@ def __init__(self, gamma=0.25):


class ZPlus(LinearHook):
'''ZPlus (or alpha=1, beta=0) LRP rule.'''
'''ZPlus (or alpha=1, beta=0) LRP rule.

Notes
-----
Note that the original deep Taylor Decomposition (DTD) specification of the ZPlus Rule
(https://doi.org/10.1016/j.patcog.2016.11.008) only considers positive inputs, as they are used in ReLU Networks.
This implementation is effectively alpha=1, beta=0, where negative inputs are allowed.
'''

def __init__(self):
super().__init__(
input_modifiers=[
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