pip install failed "in get_topological_weights assert len(weights) == len(graph)"

[wyli]

Describe the bug
the pip install command in Dockerfile failed due to the recent base image upgrade

looks like an issue from pypa/pip#9031

https://github.com/Project-MONAI/MONAI/runs/1959756220?check_suite_focus=true#step:3:233

...
sha256=552bd3a0ebe95e88c50727a6d5dbaa719f90311ff30b201af1422562c0efece3
  Stored in directory: /tmp/pip-ephem-wheel-cache-s8fybs4_/wheels/e2/62/1e/926d1ebe7b1e733c78d627fd288d01b83feaf67efc06e0e4c3
  Building wheel for black (PEP 517): started
  Building wheel for black (PEP 517): finished with status 'done'
  Created wheel for black: filename=black-20.8b1-py3-none-any.whl size=124184 sha256=2cfc4a1b33dd13c2f5a08176f5321114a91c6e92f00f6d74518237f08aee5147
  Stored in directory: /tmp/pip-ephem-wheel-cache-s8fybs4_/wheels/95/a4/59/10cd5378d52f92cdb45025f040e4686e10ae5217961c25fd66
  Building wheel for importlab (setup.py): started
  Building wheel for importlab (setup.py): finished with status 'done'
  Created wheel for importlab: filename=importlab-0.6.1-py2.py3-none-any.whl size=21290 sha256=0c4557ade6aee44d4bc41ccce04cf8246076d7e313d6f4c57233a489b1bf8e4b
  Stored in directory: /tmp/pip-ephem-wheel-cache-s8fybs4_/wheels/cb/48/e1/ec5e64d1c678795cfeefb5ebde5eb7260c044ee3322ec151b8
Successfully built gdown black importlab
ERROR: Exception:
Traceback (most recent call last):
  File "/opt/conda/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 228, in _main
    status = self.run(options, args)
  File "/opt/conda/lib/python3.8/site-packages/pip/_internal/cli/req_command.py", line 182, in wrapper
    return func(self, options, args)
  File "/opt/conda/lib/python3.8/site-packages/pip/_internal/commands/install.py", line 378, in run
    to_install = resolver.get_installation_order(
  File "/opt/conda/lib/python3.8/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 191, in get_installation_order
    weights = get_topological_weights(graph)
  File "/opt/conda/lib/python3.8/site-packages/pip/_internal/resolution/resolvelib/resolver.py", line 242, in get_topological_weights
    assert len(weights) == len(graph)
AssertionError
The command '/bin/sh -c cp /tmp/requirements.txt /tmp/req.bak   && awk '!/torch/' /tmp/requirements.txt > /tmp/tmp && mv /tmp/tmp /tmp/requirements.txt   && python -m pip install --no-cache-dir --use-feature=2020-resolver -r /tmp/requirements-dev.txt' returned a non-zero code: 2

To Reproduce
run these commands locally

MONAI/Dockerfile

Line 22 in 75b78cd

RUN cp /tmp/requirements.txt /tmp/req.bak \