Mircea Trofin 24c6c35270 [mlgo] Don't provide default model URLs
Pointed out in Issue #56432: the current reference models may not be
quite friendly to open source projects. Their purpose is only
illustrative - the expectation is that projects would train their own.
To avoid unintentionally pulling such a model, made the URL cmake
setting require explicit user setting.

Differential Revision: https://reviews.llvm.org/D129342
2022-07-11 07:37:14 -07:00
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