fix starnet export (#1850)

* fix starnet export

* fix bug

* add note

tools/export_model.py

@@ -52,9 +52,16 @@ def main():
 
     save_path = '{}/inference'.format(config['Global']['save_inference_dir'])
 
-    infer_shape = [3, -1, -1] 
+    infer_shape = [3, -1, -1]
     if config['Architecture']['model_type'] == "rec":
-         infer_shape = [3, 32, -1]
+        infer_shape = [3, 32, -1]  # for rec model, H must be 32
+        if 'Transform' in config['Architecture'] and config['Architecture'][
+                'Transform'] is not None and config['Architecture'][
+                    'Transform']['name'] == 'TPS':
+            logger.info(
+                'When there is tps in the network, variable length input is not supported, and the input size needs to be the same as during training'
+            )
+            infer_shape[-1] = 100
 
     model = to_static(
         model,