[BUG]: Loading model from 0.19 on 1.3

[GZW1234]

What happened?

A bug happened!

Version

1.3.1

Operating System

Windows

Package Manager

pip

Interface

Jupyter Notebook

Relevant log output

~\AppData\Local\Temp\ipykernel_12944\3777221198.py in <cell line: 2>()
      1 Eq_No_tps = 21
----> 2 model_tps.sympy(Eq_No_tps)

D:\Python310Install\lib\site-packages\pysr\sr.py in sympy(self, index)
   2424             SymPy representation of the best equation.
   2425         """
-> 2426         if not self.expression_spec_.supports_sympy:
   2427             raise ValueError(
   2428                 f"`expression_spec={self.expression_spec_}` does not support sympy export."

D:\Python310Install\lib\site-packages\pysr\sr.py in expression_spec_(self)
   1312     @property
   1313     def expression_spec_(self):
-> 1314         return self.expression_spec or ExpressionSpec()
   1315 
   1316     def get_best(

AttributeError: 'PySRRegressor' object has no attribute 'expression_spec'

Extra Info

No response

[MilesCranmer]

Oh I guess this is from loading a model on a newer version? You can just do

model.expression_spec = None

After loading

[MilesCranmer]

Though I’m not sure it will work FYI. The underlying Julia backend changed so much between versions 0.19 and 1.0 that it might be completely incompatible with the old pickle file.