From f4b87ca88f4e8d2eea227ea4c33236af396e84a3 Mon Sep 17 00:00:00 2001
From: Yannick Augenstein <yannick@flexcompute.com>
Date: Mon, 8 Jul 2024 14:42:34 +0200
Subject: [PATCH] Lazily load `scipy.io` in `SimulationData.to_mat_file()` to
 speed up overall module import time

---
 tidy3d/components/data/sim_data.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tidy3d/components/data/sim_data.py b/tidy3d/components/data/sim_data.py
index 9f6f730e2..f0107b4dd 100644
--- a/tidy3d/components/data/sim_data.py
+++ b/tidy3d/components/data/sim_data.py
@@ -12,7 +12,6 @@
 import numpy as np
 import pydantic.v1 as pd
 import xarray as xr
-from scipy.io import savemat
 
 from ...exceptions import DataError, FileError, Tidy3dKeyError
 from ...log import log
@@ -1041,6 +1040,8 @@ def to_mat_file(self, fname: str, **kwargs):
         modified_sim_dict = replace_values(sim_dict, None, [])
 
         try:
+            from scipy.io import savemat
+
             savemat(fname, modified_sim_dict, **kwargs)
         except Exception as e:
             raise ValueError(