!15133 fix DeepText 310 inference datatype bug

From: @yuzhenhua666
Reviewed-by: @oacjiewen,@c_34
Signed-off-by: @c_34

model_zoo/official/cv/deeptext/export.py

@@ -48,6 +48,6 @@ if __name__ == '__main__':
 
     load_param_into_net(net, param_dict_new)
 
-    img_data = Tensor(np.zeros([config.test_batch_size, 3, config.img_height, config.img_width]), ms.float16)
+    img_data = Tensor(np.zeros([config.test_batch_size, 3, config.img_height, config.img_width]), ms.float32)
 
     export(net, img_data, file_name=args.file_name, file_format=args.file_format)