WebDataset 0.2.4 doesn't run on Python < 3.8

[FrontierDK]

Hi all.

I am trying to get a virtual PC up and running, in order to try training a dataset. Using a virtual PC allows me to quickly try different configurations. I am, somewhat, trying to do as written on https://stt.readthedocs.io/en/latest/TRAINING_INTRO.html

However, when trying to run run-ldc93s1.sh, I get the error below - a syntax error. I haven't changed any code, so what can I do to get it running?

(coqui-stt-train-venv) myself@coquitest:~/Python-3.7.6/STT$ ./bin/run-ldc93s1.sh
+ [ ! -f train.py ]
+ [ ! -f data/smoke_test/ldc93s1.csv ]
+ checkpoint_dir=/home/myself/.local/share/stt/ldc93s1
+ export CUDA_VISIBLE_DEVICES=0
+ python -m coqui_stt_training.train --alphabet_config_path data/alphabet.txt --show_progressbar false --train_files data/smoke_test/ldc93s1.csv --test_files data/smoke_test/ldc93s1.csv --train_batch_size 1 --test_batch_size 1 --n_hidden 100 --epochs 200 --checkpoint_dir /home/myself/.local/share/stt/ldc93s1
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/myself/Python-3.7.6/STT/training/coqui_stt_training/train.py", line 34, in <module>
    from . import evaluate
  File "/home/myself/Python-3.7.6/STT/training/coqui_stt_training/evaluate.py", line 16, in <module>
    from .deepspeech_model import create_model, reset_default_graph
  File "/home/myself/Python-3.7.6/STT/training/coqui_stt_training/deepspeech_model.py", line 25, in <module>
    from .util.config import Config
  File "/home/myself/Python-3.7.6/STT/training/coqui_stt_training/util/config.py", line 16, in <module>
    from .augmentations import NormalizeSampleRate, parse_augmentations
  File "/home/myself/Python-3.7.6/STT/training/coqui_stt_training/util/augmentations.py", line 26, in <module>
    from .sample_collections import samples_from_source, unpack_maybe
  File "/home/myself/Python-3.7.6/STT/training/coqui_stt_training/util/sample_collections.py", line 21, in <module>
    import webdataset as wds
  File "/home/myself/Python-3.7.6/coqui-stt-train-venv/lib/python3.7/site-packages/webdataset/__init__.py", line 21, in <module>
    from .cache import (
  File "/home/myself/Python-3.7.6/coqui-stt-train-venv/lib/python3.7/site-packages/webdataset/cache.py", line 43
    while data := stream.read(chunk_size):
                ^
SyntaxError: invalid syntax

[reuben]

Looks like a bug in the WebDataset library, we need to pin the dependency until it's fixed. Thanks for filing!

[ForrestBakerIV]

you can get it going yourself by editing the file and setting it to

while data == stream.read(chunk_size)

and you should be good to go