export.py replace check_file -> check_yaml (ultralytics#8852)

* export.py replace `check_file` -> `check_yaml`

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Author: 2 people

export.py

@@ -67,7 +67,7 @@
 from models.experimental import attempt_load
 from models.yolo import Detect
 from utils.dataloaders import LoadImages
-from utils.general import (LOGGER, check_dataset, check_file, check_img_size, check_requirements, check_version,
+from utils.general import (LOGGER, check_dataset, check_img_size, check_requirements, check_version, check_yaml,
                            colorstr, file_size, print_args, url2file)
 from utils.torch_utils import select_device
 
@@ -490,7 +490,7 @@ def export_tflite(keras_model, im, file, int8, data, nms, agnostic_nms, prefix=c
         converter.optimizations = [tf.lite.Optimize.DEFAULT]
         if int8:
             from models.tf import representative_dataset_gen
-            dataset = LoadImages(check_dataset(check_file(data))['train'], img_size=imgsz, auto=False)
+            dataset = LoadImages(check_dataset(check_yaml(data))['train'], img_size=imgsz, auto=False)
             converter.representative_dataset = lambda: representative_dataset_gen(dataset, ncalib=100)
             converter.target_spec.supported_ops = [tf.lite.OpsSet.TFLITE_BUILTINS_INT8]
             converter.target_spec.supported_types = []