compressed_segmentation error

[xiuliren]

do you have any idea why does it happen?
It seems to work well with raw compression.

  File "src/gevent/greenlet.py", line 317, in gevent._greenlet.Greenlet._raise_exception
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/gevent/_compat.py", line 47, in reraise
    raise value.with_traceback(tb)
  File "src/gevent/greenlet.py", line 766, in gevent._greenlet.Greenlet.run
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/cloudvolume/scheduler.py", line 60, in realupdatefn
    res = fn()
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/cloudvolume/datasource/precomputed/image/tx.py", line 332, in process
    do_upload(imgchunk, cloudpath)
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/cloudvolume/datasource/precomputed/image/tx.py", line 270, in do_upload
    encoded = chunks.encode(imgchunk, meta.encoding(mip), meta.compressed_segmentation_block_size(mip))
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/cloudvolume/chunks.py", line 52, in encode
    return encode_compressed_segmentation(img_chunk, block_size=block_size)
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/cloudvolume/chunks.py", line 139, in encode_compressed_segmentation
    return encode_compressed_segmentation_c_ext(subvol, block_size)
  File "/mnt/home/jwu/anaconda3/envs/reneu/lib/python3.7/site-packages/cloudvolume/chunks.py", line 158, in encode_compressed_segmentation_c_ext
    return cseg.compress(subvol, block_size=block_size, order=order)
  File "src/compressed_segmentation.pyx", line 71, in compressed_segmentation.compress
TypeError: 'NoneType' object is unsliceable

[william-silversmith]

Hi Jingpeng! It looks like it corresponds to this line: https://github.com/seung-lab/compressedseg/blob/master/src/compressed_segmentation.pyx#L71

This makes me think that it's that there's no block size set. Make sure you set compressed_segmentation_block_size: [8,8,8] in the scale in the info file.

[william-silversmith]

I doubt this was the source of your issue, but I fixed a similar issue for sharded formats here: b4e24d7