Fix torch cross test on torch < 1.8

[WeichenXu123]

Related Issues/PRs

#xxx

What changes are proposed in this pull request?

Broken test:
https://github.com/mlflow-automation/mlflow/actions/runs/5939342578/job/16106694740#step:13:220

For torch 1.6 / 1.7, the module torch.utils._pytree does not exist , then it is incompatible with latest transformers bert model,
we can verify this by

PIP_EXTRA_INDEX_URL=https://download.pytorch.org/whl/cpu pip install torch==1.7

then run

>>> import torch.utils._pytree
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'torch.utils._pytree'

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[harupy]

@WeichenXu123 Looks like torch/utils/_pytree.py still exists:

https://github.com/pytorch/pytorch/blob/main/torch/utils/_pytree.py

[WeichenXu123]

@WeichenXu123 Looks like torch/utils/_pytree.py still exists:

https://github.com/pytorch/pytorch/blob/main/torch/utils/_pytree.py

But in torch 1.6 / 1.7 the module disappears. you can install it and test.

[harupy]

@WeichenXu123 Why did it disappear?

[WeichenXu123]

I checked again, I think 1.6/1.7 package is not changed and torch/utils/_pytree module never exists in these versions. I think it is because transformer package upgraded and it removes supporting for torch 1.6/1.7 @harupy

[harupy]

@WeichenXu123 Got it, then we can pin transformers.

[WeichenXu123]

@WeichenXu123 Got it, then we can pin transformers.

ok.

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[harupy]

LGTM once https://github.com/mlflow/mlflow/pull/9420/files#r1302458403 is resolved.