Also if you are getting "The regularizer is defined in Python, in which case it needs to be ported to TensorFlow.js or your JavaScript code." then replace manually replace all occurences of L2 to L1L2 which is mentioned here 'https://stackoverflow.com/questions/64063914/unknown-regularizer-...
The first part of the cost function acts as a regularizer which penalizes large values of sl,m, thus favoring similarity measures that are smooth (or penalizes high-frequency components of the similarity function). The second part of the cost function C is the least-square error function comput...