@Sturzgefahr @wlw If you inspect df_nn_final[cont_nn[0]] you’ll see that the dtype is “object”. When the dataframe was read in, Pandas wasn’t confident that the column contained integers, so assigned it a more general type. Fastai needs numeric types to perform the normalization. To fix this, modify df_nn_final such that the continuous variable is numeric:
df_nn_final = df_nn_final.astype({cont_nn[0]: 'int32'})
to_nn = TabularPandas(df_nn_final, procs_nn, cat_nn, cont_nn,
splits=splits, y_names=dep_var)