I am struggling with tensorflow gradients. I am using a custom second order optimizer where I need to compute hessians. The library I have chosen uses tf.python.ops.gradients instead of the standard tape.gradients(…). Running the below script raises a value error (gradients are None):

I was trying to build a gradient heatmap model using the following code:

I was trying to build a gradient heatmap model using the following code:

I am developing a recommendation system for H&M dataset, my goal is to recommend articles to users based on the article they have chosen and display images corresponding to the recommended items.