Add custom loss to example.py

example.py

@@ -11,7 +11,7 @@ equations = pysr(X, y, niterations=5,
     unary_operators=[
       "cos", "exp", "sin", #Pre-defined library of operators (see https://pysr.readthedocs.io/en/latest/docs/operators/)
       "inv(x) = 1/x"],
-    loss='L1DistLoss()',
+    loss='loss(x, y) = abs(x - y)', # Custom loss function
     julia_project="../SymbolicRegression.jl") # Define your own operator! (Julia syntax)
 
 ...# (you can use ctl-c to exit early)