# Individual
df['a'] = df_test['a'].astype('float64')
df['b'] = df_test['b'].astype('int64')
# Batch
dtype_d = {"a": "float64", "b": "int64"} # dtype dictio
df = df.astype(dtype_d)
gdf_test['column_name'] = gdf_test['column_name'].astype('int64')