chore(knn): better loading of data

exp/knn/main.py

@@ -68,16 +68,10 @@ def load_data(file_path):
     """
     加载 TSV 格式数据文件。
     """
-    features = []
-    labels = []
-
-    with open(file_path, "r") as file:
-        for line in file:
-            values = line.strip().split("\t")
-            features.append([float(x) for x in values[:-1]])
-            labels.append(int(values[-1]))
-
-    return np.array(features), np.array(labels)
+    data = np.loadtxt(file_path, delimiter="\t")
+    features = data[:, :-1]
+    labels = data[:, -1].astype(int)
+    return features, labels
 
 
 def upload_score(name, id, score_data):
@@ -168,6 +162,6 @@ if __name__ == "__main__":
             f"评测出错: {e}",
             traceback.format_exc(),
             "请检查代码和返回值类型是否正确！",
-            "本次评测无效！",
+            "本次评测无效，记录不做提交！",
         ]
         print("\n".join(log_details))