human
4. Data Input Function

What is a the Python code you requested?
assistant
#Here is the Python code you requested.
def make_input_fn(file_pattern, batch_size, num_epochs, 
                  mode=tf.estimator.ModeKeys.EVAL):
    
    def _input_fn():
        dataset = tf.data.experimental.make_csv_dataset(
            file_pattern=file_pattern,
            batch_size=batch_size,
            column_names=HEADER,
            column_defaults=HEADER_DEFAULTS,
            label_name=TARGET_NAME,
            field_delim=',',
            use_quote_delim=True,
            header=False,
            num_epochs=num_epochs,
            shuffle=(mode==tf.estimator.ModeKeys.TRAIN)
        )
        
        iterator = dataset.make_one_shot_iterator()
        features, target = iterator.get_next()
        return features, target
    
    return _input_fn