Unity ML Agents Package Manager is not importing Actuator script

Question

I want to test the Unity ML example "3D Ball". So, I set up environment:

1. Imported the ML Agents Package by Unity Package Manager.
2. Copied the ML Agent example Assets from Unity's official GitHub to My Project File.

Then, I opened the example scene and played that scene. But every code which contains "using Unity.MLAgents.Actuators" fails with the following error:

Assets\test.cs(5,22): error CS0234: The type or namespace name 'Actuators' does not exist in the namespace 'Unity.MLAgents' (are you missing an assembly reference?)

So, I've tried to find MLAgents.Actuator module's source code. But I didn't find anything yet.

Someone said Actuator Module is applied after ML Agent 1.0.3, but I imported the lasted version (v. 1.0.4).

How can I import the ML Agents package properly? Every YouTube tutorial does not show the problem I've encountered.

Here is my environment:

• Unity version: Unity 2020.1.0f
• ML Agents version: version 1.0.4
• ML Agents example: version Release 7

Answer 1

You have to manually install it from the repository you cloned.

Answer 2

Update the package to a 1.4.0-preview or later (depending on your Unity version, you may need to change some package manager settings to be able to see preview packages). Get the examples from a tag that corresponds to the 1.0.x package, for example com.unity.ml-agents_1.0.6

Answer 3

I added the project from "Unity Hub" rather than inserting asset folder to a new project. And then everything works fine. Even the preview packages like [com.unity.ml-agents.extensions": "file:../../com.unity.ml-agents.extensions] added automatically to the project from my project directory!

Answer 4

If you need to use the 1.0.x pacakage, make sure you're getting the examples from a compatible version (not the master branch). For example, here's the 1.0.2 tag: github.com/Unity-Technologies/ml-agents/tree/…. Looks like 1.03 and 1.0.4 tags are missing but I'll update them tomorrow. – celion Sep 27 '20 at 20:27

Celion had the right answer

Answer 5

I have the same problem, I am very new to Unity. I figured out it is something with the versioning. You need to use the proper version of the package. By installing from the Unity Registry, I was not able to install the last version.

I just install the package from the Disk. Here follow the Install the com.unity.ml-agents Unity package. It fixed my problem.

Answer 6

Unity.MLAgents.Actuators this package is in preview till this date, if you want to use this package you need to update your MLAgents package from package manager.