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

Restructure train/: nest shards into chunk subdirs (batch 65/98)

Restructure train/: nest shards into chunk subdirs (batch 64/98)

Restructure train/: nest shards into chunk subdirs (batch 63/98)

Restructure train/: nest shards into chunk subdirs (batch 62/98)

Restructure train/: nest shards into chunk subdirs (batch 61/98)

Restructure train/: nest shards into chunk subdirs (batch 60/98)

Restructure train/: nest shards into chunk subdirs (batch 59/98)