Add some deriv definition parameters in maps #1407
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Summary
Debug some definition missing
v
Summary for Squash and Merge:
def deriv(self, m, v=None):
change the definition to such format and get a right derivative of the mapping with respect to the input parameters.
Reference issue
Closes #1389
What does this implement/fix?
Add the conditional judgment:
if v is not None
Maybe the corresponding description should be changed, too.