`fastmath=True` is used in incompatible functions (breaks in numba 0.62.0rc1+)

[flying-sheep]

As @swap357 said in numba/numba#10229 (comment), smooth_knn_dist and compute_membership_strengths are not fastmath-compatible, so you need to fix this.

Also, you should start testing with pre-releases to catch issues like this before they end up in releases.