Check if alpha is not None when restricting it to be at most 1 #199
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panispani
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rflamary
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Jul 15, 2020
ot/optim.py
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| @@ -69,7 +69,7 @@ def phi(alpha1): | |||
| alpha, phi1 = scalar_search_armijo( | |||
| phi, phi0, derphi0, c1=c1, alpha0=alpha0) | |||
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| return min(1, alpha), fc[0], phi1 | |||
| return min(1, alpha) if alpha is not None else 1, fc[0], phi1 | |||
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could you put the test in another line with a small comment about what is necessary?
It is a bit hard to follow in the return
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Also I guess you have an example where the original function failed. Could you do a simple no regression test it test_optim.py to check that this problem never re-appears again? It feels as if this function always needs tuning ;)
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Hello @panpan2 could you please take into account my comment so that we can merge your PR?
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@rflamary any other changes needed to merge this?
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Types of changes
scipy.optimize.linesearch.scalar_search_armijo can return alpha=None (function definition). In optim.py:line_search_armijo as part of a previous issue #184, we restrict the value of alpha to be at most 1 with min(1, alpha) but this throws an Exception when alpha is None. In this PR, we just check the value of
alphais notNonewhen making the comparison with1.Motivation and context / Related issue
Issue: #198
How has this been tested (if it applies)
Checklist