added rsub to allow MSE calc in any order #4
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I was following along with your video but reversed the order when calculating MSE and produced a TypeError: unsupported operand type(s) for -: 'float' and 'Value' .
Because of your instructions about adding rmul in the Value class I realised how this might be fixed so subtraction order doesn't matter.
def rsub(self, other): # other - self
return self - other