TypeError: metaclass conflict in PolyaModels scripts

[judefelixt]

This issue occurs when running example predictions given in the README.md file. Despite creating a Mamba environment with the specified required package versions, all predictions throw the following error:

Environment:

• OS: CentOS 7 (Core)
• Mamba: 1.5.5

 File "PolyaID_PolyaStrength_prediction.py", line 39, in <module>
   polyaID       = utils.make_polyaid_model("PolyaID_model.h5")
 File "/home1/BAS/tenywaj/TEST/PolyaModelsHuman/predictor_tool/PolyaID_PolyaStrength_utilities.py", line 95, in make_polyaid_model
   from keras import Input
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/__init__.py", line 3, in <module>
   from . import utils
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/utils/__init__.py", line 26, in <module>
   from .vis_utils import model_to_dot
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/utils/vis_utils.py", line 7, in <module>
   from ..models import Model
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/models.py", line 10, in <module>
   from .engine.input_layer import Input
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/engine/__init__.py", line 7, in <module>
   from .network import get_source_inputs
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/engine/network.py", line 15, in <module>
   from . import saving
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/keras/engine/saving.py", line 35, in <module>
   from tensorflow.python.lib.io import file_io as tf_file_io
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/tensorflow/__init__.py", line 28, in <module>
   from tensorflow.python import pywrap_tensorflow  # pylint: disable=unused-import
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/tensorflow/python/__init__.py", line 63, in <module>
   from tensorflow.python.framework.framework_lib import *  # pylint: disable=redefined-builtin
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/tensorflow/python/framework/framework_lib.py", line 25, in <module>
   from tensorflow.python.framework.ops import Graph
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 54, in <module>
   from tensorflow.python.platform import app
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/tensorflow/python/platform/app.py", line 23, in <module>
   from absl.app import run as _run
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/absl/app.py", line 37, in <module>
   from absl import flags
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/absl/flags/__init__.py", line 35, in <module>
   from absl.flags import _argument_parser
 File "/home1/datas/miniforge3-tenywaj/envs/polyamodels/lib/python3.6/site-packages/absl/flags/_argument_parser.py", line 82, in <module>
   class ArgumentParser(Generic[_T], metaclass=_ArgumentParserCache):
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases