public function setLinearInterpolationSmoothing($trigramLambda, $bigramLambda, $unigramLambda)
{
return $this->setSmoothingModel('linear_interpolation', ['trigram_lambda' => $trigramLambda, 'bigram_lambda' => $bigramLambda, 'unigram_lambda' => $unigramLambda]);
}