Instruction

training_data_set_url - should be publicly accessible url of zip file. This zip should contain only images. ideal number of images should be between 20-100 images.
In case you are training it on subject or person, try to have images with different angels, outfit, zoom level etc...

Easy way to upload your dataset (zip) file

To make even more easy smooth experience for developers we made separate endpoint to upload dataset (zip file) it will return publicly accessible url that you can use as "training_data_set_url"
check this endpoint to see how to upload your dataset zip file in a seconds - Upload Dataset