how to finetune?

[haooxia]

I want to know if I need to rebuild the data set when finetune?
I use 20 fonts in pretraining, and use 1 font in finetuning, but it report an error:

InvalidArgumentError (see above for traceback): Restoring from checkpoint failed. This is most likely due to a mismatch between the current graph and the graph from the checkpoint. Please ensure that you have not altered the graph expected based on the checkpoint. Original error:

Assign requires shapes of both tensors to match. lhs shape= [900,1] rhs shape= [900,20]
         [[node save/Assign_130 (defined at main.py:197) ]]

Do you know how to fix it?