Error while deserialising alphabet

DeepSpeech
#1

Hi,I used pre-trained model of deepspeech v0.6.1 and used code on the transfer-learning2 branch for transfer learning. After training,at the time of evaluation I am geting error like:

  File "evaluate.py", line 183, in <module>
    tf.app.run(main)
  File "/usr/local/lib/python3.5/dist-packages/tensorflow/python/platform/app.py", line 125, in run
    _sys.exit(main(argv))
  File "evaluate.py", line 173, in main
    samples = evaluate(FLAGS.test_files.split(','), create_model, try_loading)
  File "evaluate.py", line 49, in evaluate
    Config.alphabet)
  File "/usr/local/lib/python3.5/dist-packages/ds_ctcdecoder/__init__.py", line 31, in __init__
    raise ValueError('Error when deserializing alphabet.')
ValueError: Error when deserializing alphabet.

The specifications of the training requirements are:
tensorflow == 1.13.1
ds_ctcdecoder == 0.7.0-alpha.2
numpy == 1.18.1
os- ubuntu 16.04 LTS
Can someone please help me with what shall I do?

#2

Please install matching deepspeech version.

#3

You also have the wrong version of tensorflow, and are mixing incompatible versions of the code (v0.6.1 and the transfer-learning2 branch).

#4

Apologies,I have DeepSpeech version 0.5.0-alpha.6 and I am unable to install ds-ctcdecoder version 0.5.0a6…getting this error:

Collecting ds-ctcdecoder==0.5.0a6
ERROR: HTTP error 404 while getting https://index.taskcluster.net/v1/task/project.deepspeech.deepspeech.native_client.v0.5.0-alpha.6.cpu-ctc/artifacts/public/ds_ctcdecoder-0.5.0a6-cp35-cp35m-manylinux1_x86_64.whl
ERROR: Could not install requirement ds-ctcdecoder==0.5.0a6 from https://index.taskcluster.net/v1/task/project.deepspeech.deepspeech.native_client.v0.5.0-alpha.6.cpu-ctc/artifacts/public/ds_ctcdecoder-0.5.0a6-cp35-cp35m-manylinux1_x86_64.whl because of error 404 Client Error: Not Found for url: https://index.taskcluster.net/v1/task/project.deepspeech.deepspeech.native_client.v0.5.0-alpha.6.cpu-ctc/artifacts/public/ds_ctcdecoder-0.5.0a6-cp35-cp35m-manylinux1_x86_64.whl
ERROR: Could not install requirement ds-ctcdecoder==0.5.0a6 from https://index.taskcluster.net/v1/task/project.deepspeech.deepspeech.native_client.v0.5.0-alpha.6.cpu-ctc/artifacts/public/ds_ctcdecoder-0.5.0a6-cp35-cp35m-manylinux1_x86_64.whl because of HTTP error 404 Client Error: Not Found for url: https://index.taskcluster.net/v1/task/project.deepspeech.deepspeech.native_client.v0.5.0-alpha.6.cpu-ctc/artifacts/public/ds_ctcdecoder-0.5.0a6-cp35-cp35m-manylinux1_x86_64.whl for URL https://index.taskcluster.net/v1/task/project.deepspeech.deepspeech.native_client.v0.5.0-alpha.6.cpu-ctc/artifacts/public/ds_ctcdecoder-0.5.0a6-cp35-cp35m-manylinux1_x86_64.whl

Can you please help with me it?

#5

Unfortunately, TaskCluster has been migrated to a new instance and those artifacts are not available anymore. This is very old as well, so I would recommend switching to newer version anyway.

#6

Oh I see thank you very much…but as I wanted to do transfer-learning any suggestions on what should I do? Since deepspeech version of trasnfer-learning2 branch is 0.5.0-alpha.6 it will require ds-ctcdecoder version 0.5.0a6. What can I do in this case?

#7

You could stay with the 0.6 branch and do some fine tuning for the released model. Everything is there.

At the same time install the 0.7 version in a different place and start experimenting with the newly available transfer learning:

https://github.com/mozilla/DeepSpeech/search?q=drop_source_layers&unscoped_q=drop_source_layers

You will then be able to compare both approaches once the new model is available.

As all of Europe is staying at home, I guess there is not much else to do but getting the next release out :slight_smile:

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