Two different OnActionReceived(.. ) functions in Agent definition

Hi. I noticed that there are two OnActionReceived() functions in Agent.cs metadata definition :

1. public virtual void OnActionReceived(ActionBuffers actions);
2. public override void OnActionReceived(float[] vectorAction);

and as I watch tutorials or search the Web people seem to have both of them. I, on the other hand, only have one:

• if I import ML Agents Package (different versions) from Package Manager's Unity Registry I get the second one.
• And when I import this package (release 17) from local disk, previously downloading the repo (like it says here https://github.com/Unity-Technologi...d#advanced-local-installation-for-development ) I get the first one.

How I get only one installing from local disk, I understand : the thing could be, that in release_17 only the first one is present. Does this mean, that the second one is gone?

There is also one follow up question : there is only one implementation of the function here (https://docs.unity3d.com/Packages/com.unity.ml-agents@1.0/api/Unity.MLAgents.Agent.html), which could explain why I get only the second version of the function from Unity's Registry no matter what version of ml-agent package I install. But still, I saw people have it. What is the trick here? This really bothers me..