Restructure train/: nest shards into chunk subdirs (batch 97/98)

Restructure train/: nest shards into chunk subdirs (batch 76/98)

Restructure train/: nest shards into chunk subdirs (batch 75/98)

Restructure train/: nest shards into chunk subdirs (batch 74/98)

Restructure train/: nest shards into chunk subdirs (batch 73/98)

Restructure train/: nest shards into chunk subdirs (batch 72/98)

Restructure train/: nest shards into chunk subdirs (batch 71/98)

Restructure train/: nest shards into chunk subdirs (batch 70/98)