Siddhi Kiran Bajracharyya

Easier for people to create a docker environment and run their experiments.

Update Dockerfile

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- downgraded psutil version because the specified version was not working with jupyter lab. - upgraded python 3.7 to 3.9.

Hi! Could you please check this PR. the tests have been passed for the shape_context.py and now it supports python3.

Formatted imports

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My little effort to format imports