'TypeError: First element of field tuple is neither a tuple nor str

I am a beginner to RAPIDS. I am trying to run the following code on Colab. It is resulting in an error. TypeError: First element of field tuple is neither a tuple nor str

Similari code runs well while using pandas. But failing while using cudf dataframe apply.

Code Snippet:

dataSet_formatted_gdf = cudf.DataFrame.from_pandas(pd.DataFrame(dataset_formatted_npa)) conAttrs_gdf = cudf.DataFrame.from_pandas(pd.DataFrame(dataset_formatted_npa[:, 0]))

equivalenceClasses = conAttrs_gdf.groupby(0).groups

decAttr_gdf = cudf.DataFrame.from_pandas(pd.DataFrame(dataset_formatted_npa[:, 1]))

decisionClasses = decAttr_gdf.groupby(0).groups

rough_membership_values = dataSet_formatted_gdf.apply(lambda x: calculateRoughMembership(x, equivalenceClasses, decisionClasses), axis=1)

rapidscudf


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