[BUG] UMAP with `verbose=True` logs very large arrays

[jcrist]

When fitting UMAP with verbose=True, some very very large arrays are logged, making the logs unusable for tracking stages of the computation. My goal with setting verbose=True was to track stages of the computation as fitting on large data can take a while.

Ideally we should avoid logging large arrays, especially in a setting a user is likely to be using. If logging those arrays is still sometimes desired, we should move those logs to TRACE which can only be set by setting verbose=6.