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

Restructure train/: nest shards into chunk subdirs (batch 92/98)

Restructure train/: nest shards into chunk subdirs (batch 91/98)

Restructure train/: nest shards into chunk subdirs (batch 90/98)

Restructure train/: nest shards into chunk subdirs (batch 89/98)

Restructure train/: nest shards into chunk subdirs (batch 88/98)

Restructure train/: nest shards into chunk subdirs (batch 87/98)

Restructure train/: nest shards into chunk subdirs (batch 86/98)