moves custom image_size into metadata
moves custom image_size into metadata

googlecreativelab/teachablemachine-community,googlecreativelab/teachablemachine-community,googlecreativelab/teachablemachine-community,googlecreativelab/teachablemachine-community,googlecreativelab/teachablemachine-community,googlecreativelab/teachablemachine-community,googlecreativelab/teachablemachine-community