minor: fix flake8 issue

mrava87 · mrava87 · commit a865e15e6a8c · 2025-08-28T21:14:37.000+01:00
diff --git a/pylops/optimization/callback.py b/pylops/optimization/callback.py
@@ -7,8 +7,6 @@
 
 from typing import TYPE_CHECKING, Dict, List, Optional, Sequence
 
-import numpy as np
-
 from pylops.utils.metrics import mae, mse, psnr, snr
 from pylops.utils.typing import NDArray
 
