ML-Agents won't start training

I try to start the training by running

mlagents-learn config/trainer_config.yaml --run-id=firstRun --train

Yet the Anaconda Prompt gives me this error:

Traceback (most recent call last):
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in <module>
from tensorflow.python.pywrap_tensorflow_internal import *
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in <module>
_pywrap_tensorflow_internal = swig_import_helper()
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 24, in swig_import_helper
_mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\imp.py", line 242, in load_module
return load_dynamic(name, filename, file)
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\imp.py", line 342, in load_dynamic
return _load(spec)
ImportError: DLL load failed: The specified module could not be found
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\Scripts\mlagents-learn-script.py", line 11, in <module>
load_entry_point('mlagents', 'console_scripts', 'mlagents-learn')()
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\pkg_resources\__init__.py", line 490, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\pkg_resources\__init__.py", line 2862, in load_entry_point
return ep.load()
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\pkg_resources\__init__.py", line 2453, in load
return self.resolve()
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\pkg_resources\__init__.py", line 2459, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "c:\users\user\desktop\ml-agents-15.0-capstone\ml-agents-release_1\ml-agents\mlagents\trainers\learn.py", line 12, in <module>
from mlagents import tf_utils
File "c:\users\user\desktop\ml-agents-15.0-capstone\ml-agents-release_1\ml-agents\mlagents\tf_utils\__init__.py", line 1, in <module>
from mlagents.tf_utils.tf import tf as tf # noqa
File "c:\users\user\desktop\ml-agents-15.0-capstone\ml-agents-release_1\ml-agents\mlagents\tf_utils\tf.py", line 3, in <module>
import tensorflow as tf # noqa I201
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\__init__.py", line 41, in <module>
from tensorflow.python.tools import module_util as _module_util
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\__init__.py", line 50, in <module>
from tensorflow.python import pywrap_tensorflow
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 69, in <module>
raise ImportError(msg)
ImportError: Traceback (most recent call last):
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow.py", line 58, in <module>
from tensorflow.python.pywrap_tensorflow_internal import *
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 28, in <module>
_pywrap_tensorflow_internal = swig_import_helper()
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\site-packages\tensorflow\python\pywrap_tensorflow_internal.py", line 24, in swig_import_helper
_mod = imp.load_module('_pywrap_tensorflow_internal', fp, pathname, description)
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\imp.py", line 242, in load_module
return load_dynamic(name, filename, file)
File "C:\Users\user\anaconda3\envs\mlagentsrelease1\lib\imp.py", line 342, in load_dynamic
return _load(spec)
ImportError: DLL load failed: The specified module could not be found
Failed to load the native TensorFlow runtime.
See https://www.tensorflow.org/install/errors
for some common reasons and solutions. Include the entire stack trace
above this error message when asking for help.

 

Hello!

What version of Python did you install?

I'm on Windows and with Python 3.8 I couldn't install mlagents package completely (missing native package for Tensorflow dependency). I had to install Python 3.7.7.

PS: Are you sure about --train flag? It's not listed by the binary when using --help

 

I have solved the problem. The reason it gave this error was the version of the TensorFlow. When I downgraded TensorFlow to 2.0.0, it didn't give any errors. Also it doesn't work well with Python 3.8. I had to install 3.7.7.

 

Also I had to activate the ml agents environment to start the training.

 

For the initial DLL error, see this tensorflow github issue. You'll need to install Microsoft Visual C++ Redistributable for Visual Studio 2015, 2017 and 2019.