Pytorch dependency for Flair too restrictive

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Hi,

When trying to `pip install polyfuzz[flair]`, pip is not able to resolve the pytorch dependency:

```
INFO: pip is looking at multiple versions of polyfuzz[flair] to determine which version is compatible with other requirements. This could take a while.
Collecting polyfuzz[flair]
Downloading polyfuzz-0.2.0-py2.py3-none-any.whl (25 kB)
Downloading polyfuzz-0.0.1-py2.py3-none-any.whl (21 kB)
WARNING: polyfuzz 0.0.1 does not provide the extra 'flair'
Collecting sparse-dot-topn>=0.2.9
Downloading sparse_dot_topn-0.3.1.tar.gz (17 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... done
Installing backend dependencies ... done
Preparing metadata (pyproject.toml) ... done
ERROR: Cannot install polyfuzz[flair]==0.2.2, polyfuzz[flair]==0.3.0, polyfuzz[flair]==0.3.1, polyfuzz[flair]==0.3.2, polyfuzz[flair]==0.3.3, polyfuzz[flair]==0.3.4 and polyfuzz[flair]==0.4.0 because these package versions have conflicting dependencies.

The conflict is caused by:
polyfuzz[flair] 0.4.0 depends on torch<1.7.1 and >=1.4.0; extra == "flair"
polyfuzz[flair] 0.3.4 depends on torch<1.7.1 and >=1.4.0; extra == "flair"
polyfuzz[flair] 0.3.3 depends on torch<1.7.1 and >=1.4.0; extra == "flair"
polyfuzz[flair] 0.3.2 depends on torch>=1.2.0; extra == "flair"
polyfuzz[flair] 0.3.1 depends on torch>=1.2.0; extra == "flair"
polyfuzz[flair] 0.3.0 depends on torch>=1.2.0; extra == "flair"
polyfuzz[flair] 0.2.2 depends on torch>=1.2.0; extra == "flair"

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict
```

Neither pip nor conda offers pytorch version less than 1.9, current release is 1.13 - is the strict dependency something that can be updated without breaking anything?

Or have I just missed something obvious here?

Standard polyfuzz 0.4 install works just fine, otherwise - but I'd like to try out flair!

Thanks, Indy

No dependency file or test is named in the issue. Start by reproducing `pip install polyfuzz[flair]` and locating the package metadata that declares the Flair extra; done means the extra resolves with an available PyTorch version while the standard PolyFuzz install still works.

Written by the indexing model from the issue text.