Installation fails when trying to install pandas

[catalys1]

🐛 Bug

When trying to install lightning-flash via pip install lightning-flash, I get an error caused by the dependency on pandas==1.1.2:

ERROR: Could not build wheels for pandas which use PEP 517 and cannot be installed directly

I get the same error when I try to install pandas==1.1.2 independent of lightning-flash. I am able to install pandas==1.2.2 without any problems. I'm using Python 3.9.1 and Ubuntu 20.04.

Is it necessary to have the pandas version fixed at 1.1.2?

Expected behavior

Installation without any problems

Environment

• PyTorch Version (e.g., 1.0): 1.7
• OS (e.g., Linux): Ubuntu 20.04
• How you installed PyTorch (conda, pip, source): pip
• Build command you used (if compiling from source):
• Python version: 3.9.1
• CUDA/cuDNN version: 10.2
• GPU models and configuration: 1080TI
• Any other relevant information:

[Borda]

I think that this would be also solved by #62
cc: @carmocca

[kaushikb11]

It's a python 3.9 issue.
@Borda #125 It would fix it for now.