bcol

### Issue Description When locally running [memit.ipynb](https://github.com/kmeng01/memit/blob/main/notebooks/memit.ipynb), an error occurs as follows: ```shell Retrieving covariance statistics for EleutherAI_gpt-j-6B @ transformer.h.3.mlp.fc_out. Attempting to download EleutherAI_gpt-j-6B/wikipedia_stats/transformer.h.3.mlp.fc_out_float32_mom2_100000.npz from https://memit.baulab.info/data/stats/EleutherAI_gpt-j-6B/wikipedia_stats/transformer.h.3.mlp.fc_out_float32_mom2_100000.npz. Unable to download due...