anishpatel

$$ L(A,F) = \frac{1}{K}|R\circ(S-AF)|_2^2. $$

Compute the partial derivatives of $L$ with respect $A$ and $F$. Show that $$\frac{\partial L}{\partial A} = \frac{-2}{K}[R\circ(S-AF)]F^\top.$$ and $$\frac{\partial L}{\partial F} = \frac{-2}{K}A^\top[R\circ(S-AF)].$$

anishpatel

import scala.collection.immutable.List;

abstract class ForkJoin {

  protected def getList[T]: List[T]

  def apply[A, B]: (List[A], List[B]) = {
    (getList[A], getList[B])
  }
}

anishpatel

#!/usr/bin/env python3

def echoeval(expr_str):
    global sys, pprint
    try: sys
    except NameError: import sys
    try: pprint
    except NameError: from pprint import pprint
    calling_frame = sys._getframe().f_back
    print(expr_str, '=', end=' ')