The PHATE Operator get's stuck in the landmark operation when using precomputed ```knn_dist```

[bjoaofelipe]

Describe the bug
The PHATE Operator get's stuck in the landmark operation when using precomputed knn_dist

To Reproduce

import phate
phate_op = phate.PHATE(knn_dist='precomputed', knn=7, t=10, n_jobs=-1)
emb = phate_op.fit_transform(D)

Expected behavior
Computation should take more or less the same time as version 1.0.11.

Actual behavior
Code never passes the landmark computation

[MattScicluna]

Could you provide a complete, minimal example that reproduces the bug and attach any output (stdout/stderr)? If there’s no output, please confirm whether the code terminates or hangs.

[MattScicluna]

I made a pytest to check this: #176
Currently it is passing. So there could be something else causing the bug.