13. A system, comprising: at least one processor; memory including instructions operable to be executed by the at least one processor to cause the system to: receive audio data corresponding to a first utterance; perform first automatic speech recognition (ASR) processing on the audio data using a language model to generate a hypothesis, the hypothesis including a first word, wherein: the language model was trained using a first prior probability for the first word, the first prior probability based on a group prior probability for a plurality of words, the group prior probability based on a total number of predictions of the plurality of words during ASR testing and a total number of correct predictions of the plurality of words during the ASR testing, at least one of the plurality of words is not included in the hypothesis, and performing the first ASR processing on the audio data comprises: identifying the first word, and determining a confidence score for the hypothesis using the language model; and generate output data using the hypothesis.
13. A system, comprising: at least one processor; memory including instructions operable to be executed by the at least one processor to cause the system to: receive audio data corresponding to a first utterance; perform first automatic speech recognition (ASR) processing on the audio data using a language model to generate a hypothesis, the hypothesis including a first word, wherein: the language model was trained using a first prior probability for the first word, the first prior probability based on a group prior probability for a plurality of words, the group prior probability based on a total number of predictions of the plurality of words during ASR testing and a total number of correct predictions of the plurality of words during the ASR testing, at least one of the plurality of words is not included in the hypothesis, and performing the first ASR processing on the audio data comprises: identifying the first word, and determining a confidence score for the hypothesis using the language model; and generate output data using the hypothesis. 18. The system of claim 13 , the set of actions further comprising: receiving feedback indicating whether the first word was correctly predicted during the first ASR processing; determining a total number of first predictions for the first word by adding a first number of predictions during ASR testing and a second number of times the first word was predicted during the first ASR processing; determining a first number of correct results for the first word, the first number of correct results corresponding to a number of times the first word was correctly predicted during the ASR testing and the first ASR processing; and determining an individual prior probability for the first word by dividing the first number of correct results and the total number of first predictions.