facedetector now returns a list of tensors containing the boxes x image

[lferraz]

Changes

Now the FaceDetector returns lists of tensors instead of a tensor. It returns a list because not in all the images the number of boxes is the same.

Fixes # (issue)
When passing batches to the face detector the code failed because was partially not ready to support them.

Type of change

• 📚 Documentation Update
• 🧪 Tests Cases
• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🔬 New feature (non-breaking change which adds functionality)
• 🚨 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 This change requires a documentation update

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Did you update CHANGELOG in case of a major change?

[edgarriba]

can you add a quick test to validate i/o shapes?

[lferraz]

can you add a quick test to validate i/o shapes?

I improved one existing tests adding batches and some shape checks but it is not as simple as other ops.

[edgarriba]

LGTM. Minor changes