It is explained here: https://github.com/allegroai/clearml/issues/91#issuecomment-578544866
Hi WackyRabbit7 and ReassuredTiger98
While what Tim said was true, it only applies to the Python binary used to create the venv (i.e. the venv will still be created).
WackyRabbit7 , to specify an pre-existing venv you can use the
CLEARML_AGENT_SKIP_PIP_VENV_INSTALL=<path-to-venv-binary> env var