bugfixed: import error (#13994)

Co-authored-by: guangpin.ye <guangpin.ye@lpht.com>

Author: yes-github

deploy/slim/quantization/export_model.py

@@ -34,7 +34,7 @@
 import tools.program as program
 from paddleslim.dygraph.quant import QAT
 from ppocr.data import build_dataloader, set_signal_handlers
-from tools.export_model import export_single_model
+from ppocr.utils.export_model import export_single_model
 
 
 def main():