Dataset metadata for text sentiment.
.. attribute:: sentiment_max
Required. A sentiment is expressed as an integer ordinal,
where higher value means a more positive sentiment. The
range of sentiments that will be used is between 0 and
sentiment_max (inclusive on both ends), and all the values
in the range must be represented in the dataset before a
model can be created. sentiment_max value must be between 1
and 10 (inclusive).