Oleksandr Maksymets comments

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                                            Oleksandr Maksymets

Added updates for HM3D ObjectNav training

@srama2512, @devendrachaplot how we want evolve this PR? Do we more up to date code focused on ObjectNav

Update Dockerfile

@ruffsl thank you for the PR. Can reveal some details behind changing Docker file from ubuntu16.04 to ubuntu18.04? Does that makes a reason to have several Dockerfiles?

Interactive viewer does not work with X11 forwarding

@takuma-ynd, @StOnEGiggity thank you for reporting the issue. Is still doesn't work on latest commit of habitat-sim?

Geodesic distance return inf in many cases.

@erick84mm, a geodesic distance is calculated on top of navigation mesh that contains navigable points and is calculated for particular agent's size. If you have other logic in mind you...

Geodesic distance return inf in many cases.

@erick84mm thank you for the update and @erikwijmans for answering the question. If you manage to find a reasonable correspondence to 3320 dropped locations from VLN dataset, let us know.

Geodesic distance return inf in many cases.

Maybe `TELEPORT` is considered an action with continuous action space.

Same mesh for semantics and color (MP3D)

Clarifying question: @msavva how do you find correspondence between semantic and original meshes for MP3D?

Assign mesh holes max depth for Depth Sensor

I see, we going with emulating real Depth sensors here. @erikwijmans do you know if our current noise model have special handling of such undefined values? Thank you!

Assign mesh holes max depth for Depth Sensor

Thank you for the clarification. Possibly, that can be a configurable feature of the depth sensor. Otherwise the same can be done with the observation transformation on Habitat Lab side...

A tutorial of using VectorEnv for multiple processes, e.g. the shortest path following example?

We don't have such tutorial yet.