It gets the following error when I run pytest

[1200Caixia]

It gets the following error when I run pytest

===================================================================== short test summary info =====================================================================
FAILED baselines/common/tests/test_serialization.py::test_serialization[mlp-deepq] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[mlp-a2c] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[mlp-acktr] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[mlp-acer] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[mlp-ppo2] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[mlp-trpo_mpi] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn-deepq] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn-a2c] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn-acktr] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn-acer] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn-ppo2] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn-trpo_mpi] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[lstm-a2c] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[lstm-ppo2] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn_lnlstm-a2c] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
FAILED baselines/common/tests/test_serialization.py::test_serialization[cnn_lnlstm-ppo2] - urllib.error.URLError: <urlopen error [Errno 104] Connection reset by peer>
============================================== 16 failed, 78 passed, 32 skipped, 4226 warnings in 367.65s (0:06:07) ===============================================