fixed bug with GPU in gaussian_approx

Author: AlessandroLovo

PLASIM/gaussian_approx.py

@@ -213,7 +213,7 @@ def _fit(self, X, A):
 
         if self.GPU:
             # convert back to CPU
-            self.p = np.copy(self.p)
+            self.p = self.engine.asnumpy(self.p)
 
         # compute the projected coordinate and the rescaling
         self.f_tr = X @ self.p