issue #11150 Ensure explicit column selection and data type setting i…

…n data reading process. (#11302)

* issue #11150 Ensure explicit column selection and data type setting in data reading process.

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

machine_learning/sequential_minimum_optimization.py

@@ -463,7 +463,11 @@ def test_cancel_data():
         with open(r"cancel_data.csv", "w") as f:
             f.write(content)
 
-    data = pd.read_csv(r"cancel_data.csv", header=None)
+    data = pd.read_csv(
+        "cancel_data.csv",
+        header=None,
+        dtype={0: str},  # Assuming the first column contains string data
+    )
 
     # 1: pre-processing data
     del data[data.columns.tolist()[0]]