Error measuring embedding size for some DPR models

[davidkyle]

Installing the ance-dpr-context-multi model with the eland_import_hub_model script fails.

eland_import_hub_model       
    --url 'http://localhost:9200'             
    --hub-model-id 'ance-dpr-context-multi'
    --task-type text_embedding 

The error is due to unpacking a tuple that contains a single element.

python3.10/site-packages/eland/ml/pytorch/transformers.py", line 735, in _create_config
    text_embedding, _ = sample_embedding
ValueError: not enough values to unpack (expected 2, got 1)

The fix is to only take the first element

[joshdevins]

This works but it's maybe obscure Python code. We don't actually need to unpack the whole tuple, so it might make it clearer to just extract the first element, which is what we actually care about:

text_embedding = sample_embedding[0]

[davidkyle]

buildkite test this