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# BEGIN - DO NOT CHANGE THESE IMPORTS/CONSTANTS OR IMPORT ADDITIONAL PACKAGES from collections import Counter PADDING_VALUE = 0 UNK_VALUE =1 # END - DO

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\# BEGIN - DO NOT CHANGE THESE IMPORTS/CONSTANTS OR IMPORT ADDITIONAL PACKAGES from collections import Counter PADDING_VALUE = 0 UNK_VALUE =1 \# END - DO NOT CHANGE THESE IMPORTS/CONSTANTS OR IMPORT ADDITIONAL PACKAGES. \# split_train_val_test \# This method takes a dataframe and splits it into train/val/test splits. \# It uses the props argument to split the dataset appropriately. \# \# args: \# df - the entire dataset DataFrame \# props - proportions for each split in the order of [train, validation, test \# the last value of the props array is repetitive, but we've kept it \# \# returns: \# train DataFrame, val DataFrame, test DataFrame \# def split_train_val_test(df, props=[.8, . 1,1]): assert round(sum(props), 2 ) =1 and len(props) >= 2 train_df, test_df, val_df = None, None, None \#\# YoUR CODE STARTS HERE ( 35 lines of code) \#\# \# Hint: you can use df.iloc to slice into specific indexes or ranges

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