[KeyPoints] - extend from_mediapipe with Google MediaPipe FaceMesh

[LinasKo]

Description

Much like #1174 and #1232 adding pose landmark support, we'd also like to add face detection support to the from_mediapipe method.

• Add Skeleton.FACEMESH_TESSELETION of size 468 to the Skeleton enum.
  • The nodes can be found here: https://github.com/google-ai-edge/mediapipe/blob/8cb99f934073572ce73912bb402a94f1875e420a/mediapipe/python/solutions/face_mesh_connections.py#L74
  • Docs can be found here: https://github.com/google-ai-edge/mediapipe/blob/master/docs/solutions/face_mesh.md
• Add the code to the from_mediapipe function in KeyPoints object that is introduced in Feat/keypoints from mediapipe #1232.
• We'd like to support responses from both legacy and modern way to call the face mesher - see links below.

Links:

• Google Mediapipe repository: https://github.com/google/mediapipe
• Google Mediapipe face landmarker: https://ai.google.dev/edge/mediapipe/solutions/vision/face_landmarker
  • Python Guide (Modern): https://ai.google.dev/edge/mediapipe/solutions/vision/face_landmarker/python
  • Legacy: https://colab.research.google.com/github/googlesamples/mediapipe/blob/main/examples/face_landmarker/python/%5BMediaPipe_Python_Tasks%5D_Face_Landmarker.ipynb
• Skeletons: https://github.com/google-ai-edge/mediapipe/blob/8cb99f934073572ce73912bb402a94f1875e420a/mediapipe/python/solutions/face_mesh_connections.py#L74

Additional

• Note: Please share a Google Colab with minimal code to test the new feature. We know it's additional work, but it will speed up the review process. The reviewer must test each change. Setting up a local environment to do this is time-consuming. Please ensure that Google Colab can be accessed without any issues (make it public). Thank you! 🙏🏻

[LinasKo]

Hey @David-rn,

I saw your comment regarding the lazy loader / high memory usage issue. I need to scope out that one first, but if you're keen to contribute and enjoyed the work on MediaPipe, this one is up for grabs 😉

[onuralpszr]

@LinasKo if not I worked face mesh before so I really want to be involved too

[LinasKo]

Hi @onuralpszr,

Sure, we can reserve it for you - I recall you mentioning it before 🙂

However, we can afford to a wait a little bit, so I'd prefer to close the sinks and maybe the water meter cookboks first (I have some feedback to send about the latter).