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Thresholds a histogram by values.

histogram_keys A rank-1 Tensor containing a list of strings representing the keys in the input histogram.
histogram_values A rank-1 Tensor containing a list of floats representing the values for each key in histogram_keys.
threshold A float tensor to threshold the input histogram. The (key, value) pairs where value is less than threshold are filtered out in the returned histogram.

A tuple (histogram_keys_thresholded, histogram_values_thresholded) of the histogram after being thresholded.