Removing trailing whitespace as suggested by lintrunner

Author: leomilano

beginner_source/examples_autograd/polynomial_autograd.py

@@ -49,7 +49,7 @@
     # Now loss is a Tensor of shape (1,)
     # loss.item() gets the scalar value held in the loss.
     loss = (y_pred - y).pow(2).sum()
-    
+
     # Calculare initial loss, so we can report loss relative to it
     if t==0:
         initial_loss=loss.item()