Zero Brains (Agents/Policies) in getting_started notebook

[beluis3d]

Describe the bug
It looks like Brains are being transitioned into Agents & Policies:
#2729
But I do not have access to the Design Doc for these changes
https://docs.google.com/document/d/1hBhBxZ9lepGF4H6fc6Hu6AW7UwOmnyX3trmgI3HpOmo/edit#

Issue:
There are 0 brains in the getting-started notebook

To Reproduce
There is a reference to Brain in this Notebook:
https://github.com/Unity-Technologies/ml-agents/blob/master/notebooks/getting-started.ipynb

I'm trying to run this notebook, and I have my environment executable file in the right place now.
But (based on my research), it looks like I need to set my Brain to "external"

The error is that there are 0 brains:
"Unity Academy name: Ball3DAcademy; Number of Training Brains : 0"
And the code expects at least one brain:
"env = UnityEnvironment(file_name=env_name); default_brain = env.external_brain_names[0]; brain = env.brains[default_brain]"

Notes:
I believe the resolution when Brain's existed was to make sure that the Brain was set to External and to set the Control tickmark, but I do not see any of those options in Unity's Ball3dAcademy example now. If Brain's no longer exist (as I'm understanding), then what is the solution to this now?

Environment (please complete the following information):

• MacOS High Sierra 10.13.6
• ML-Agents version: master (ML-Agents Code Restructure #1083) ; 0.11.0 ; 0.5.0a
• TensorFlow version: Version: 1.15.0

[HugeKangroo]

Hello,
I have got same problem in my ml-agent project. I found that the behaviorparameters has failed when :

ml-agents/UnitySDK/Assets/ML-Agents/Scripts/Policy/BehaviorParameters.cs

Lines 40 to 43 in 8a08bc4

	if (FindObjectOfType<Academy>().IsCommunicatorOn)
	{
	return new RemotePolicy(m_BrainParameters, m_BehaviorName);
	}

I also checked the Academy, It failed at :

ml-agents/UnitySDK/Assets/ML-Agents/Scripts/Academy.cs

Lines 294 to 307 in 8a08bc4

	try
	{
	var unityRLInitParameters = Communicator.Initialize(
	new CommunicatorInitParameters
	{
	version = k_ApiVersion,
	name = gameObject.name,
	environmentResetParameters = new EnvironmentResetParameters
	{
	resetParameters = resetParameters,
	customResetParameters = customResetParameters
	}
	});
	Random.InitState(unityRLInitParameters.seed);

It looks like ml-agent try to detect python process and result with an exception.

[shihzy]

hi @beluis3d and @HugeKangroo - refer to this issue - #2856

We also cleaned up the logging here. #2950

We just pushed out release 0.12 that has these fixes. Please re-open if this is still persistent. Than you.

[github-actions]

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