Localise output‑dtype; remove global set_api_output_dtype calls #6561
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What
cuml.internals.set_api_output_dtype
calls from:svm/svm_base.pyx
neighbors/kneighbors_regressor.pyx
experimental/fil/fil.pyx
legacy/fil/fil.pyx
out_dtype
locally and casts once beforereturn
.Why
Changing the global output‑dtype inside estimator methods causes
unpredictable side‑effects on subsequent cuML calls.
This PR localises dtype handling, ensuring thread‑/call‑safety.
Fixes
Closes #6412