fix(mim/__init__.py): fix the mim command crashes due to requirements…

… version conflict

mim/__init__.py

@@ -1,4 +1,30 @@
 # Copyright (c) OpenMMLab. All rights reserved.
+
+# flake8: noqa
+
+####### Fix the mim command crashes due to requirements version conflict. ######
+# `pkg_resources` checks for a `__requires__` attribute in the `__main__` module
+# when initializing the default working set, and uses this to ensure a suitable
+# version of each affected distribution is activated.
+#
+# The entry point scripts create by `setuptools` use the `__requires__` feature
+# for compatibility with `easy_install` but may cause mim crash when version
+# conflict exists.
+#
+# Hence, we here remove the `__requires__` declare in mim entry point script before
+# importing pkg_resources to handle this situation. This workaround works fine so
+# far, but not sure if it would cause other unknown problems or not.
+#
+# Related Links:
+# - https://github.com/open-mmlab/mim/issues/143
+# - https://setuptools.pypa.io/en/latest/pkg_resources.html?highlight=__requires__
+# - https://github.com/pypa/setuptools/issues/2198
+
+import sys
+
+sys.modules['__main__'].__requires__ = ''  # type: ignore
+################################# The end! #####################################
+
 from .commands import (
     download,
     get_model_info,