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		$self->{'model'}{'alpha'} = $args{'alpha'};
	}
	if ( defined( $args{'priors'} ) ) {
		$self->{'model'}{'priors'} = $args{'priors'};
	}
} ## end sub tweak

=head2 to_string

Returns the model as a JSON string. See the section MODEL FORMAT for
what the JSON looks like.

    my $json = $nb->to_string;

The JSON is generated with canonical set, so the keys are sorted,
meaning two calls against the same model will always produce identical
output, making it diffable.

If token_splitter or stop_regex was set to a qr// Regexp, it is
stringified, so the result is always JSON safe.