def _create_polynomial_model(<EOL>name: str,<EOL>symbol: str,<EOL>degree: int,<EOL>ds: DataSet,<EOL>dss: dict):
ds_name = ds.name.split("<STR_LIT:.>")[<NUM_LIT:0>].lower()<EOL>file_name = f"<STR_LIT>"<EOL>newmod = PolynomialModelT.create(ds, symbol, degree)<EOL>newmod.plot(dss, _path(f"<STR_LIT>"), False)<EOL>newmod.write(_path(f"<STR_LIT>"))<EOL>
Create a polynomial model to describe the specified property based on the
specified data set, and save it to a .json file.

:param name: material name.
:param symbol: property symbol.
:param degree: polynomial degree.
:param ds: the source data set.
:param dss: dictionary of all datasets.