[BodyPix] Update BodyPix to v2.0.0

[joeyklee]

Dear ml5 community,

I'm submitting a new issue. Please see the details below.

→ Step 1: Describe the issue 📝

Did you find a bug? Want to suggest an idea for feature?

• suggesting an enhancement

→ Step 2: Screenshots or Relevant Documentation 🖼

Here's some helpful screenshots and/or documentation of the new feature

BodyPix 2.0 is out! - We should update this dep before making a new release. Also related to: #627

• https://github.com/tensorflow/tfjs-models/tree/master/body-pix

cc/ @shiffman @oveddan

[oveddan]

BodyPix 2.0 is way better! The segmentation masks now work for multiple people and are more accurate.

Also you can get a mask for each person.

I would make the ml5 api method take imageScaleFactor as an argument, as bodyPix 2.0 is soon going to change to that, and ml5 would internally handle setting inputResolution until the bodypix api is updated to take inputResolution at inference time.

See the discussion in this PR:
tensorflow/tfjs-models#313

[sproutleaf]

See ml5js/ml5-next-gen#11!