Fix importing patch_decoder

Fix error:  attempted relative import with no known parent package

src/timesfm.py

@@ -35,7 +35,7 @@
 from praxis import pytypes
 from praxis.layers import normalizations
 from praxis.layers import transformers
-from . import patched_decoder
+import patched_decoder
 from utilsforecast.processing import make_future_dataframe
 
 instantiate = base_hyperparams.instantiate