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scipy.optimize.line_search returns None
See original GitHub issueI’m trying to use the scipy.optimize.line_search command but instead of giving me the three values promised by the docs, it gives me (None, 13, 0, None, 853161.73010506318, None) with the optimal alpha nowhere to be found.
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- State:
- Created 9 years ago
- Comments:11 (7 by maintainers)
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The documentation does not mention it, but
Nonemeans that a suitable step length was not found. Can happen e.g. if the direction is not a descent direction.@pv This issue is a bit old. Not sure if there are still documentation issues here, if so I’m happy to resolve. Are there still remaining issue(s) to resolve? The first 2 issues listed by @argriffing with links have been merged and the referenced PR has also been merged.