16. Non-transitory computer-readable storage comprising executable code that, when executed, causes one or more computing devices to perform a process comprising: obtaining from a client device: audio input, wherein less than all of the audio input comprises audio data likely corresponding to a keyword; contextual information associated with the audio input; and information indicating a portion of audio input, of a plurality of portions of the audio input, that likely corresponds to the keyword; obtaining acoustic information and environmental information from the portion of the audio input; determining that audio data corresponding to the keyword is present in the audio input using a detection model configured to generate a detection score using the audio input, the contextual information, the environmental information, and the acoustic information, wherein a detection score satisfying a detection threshold indicates audio data corresponding to the keyword is present in the audio input; and performing an action corresponding to a request in the audio input.
16. Non-transitory computer-readable storage comprising executable code that, when executed, causes one or more computing devices to perform a process comprising: obtaining from a client device: audio input, wherein less than all of the audio input comprises audio data likely corresponding to a keyword; contextual information associated with the audio input; and information indicating a portion of audio input, of a plurality of portions of the audio input, that likely corresponds to the keyword; obtaining acoustic information and environmental information from the portion of the audio input; determining that audio data corresponding to the keyword is present in the audio input using a detection model configured to generate a detection score using the audio input, the contextual information, the environmental information, and the acoustic information, wherein a detection score satisfying a detection threshold indicates audio data corresponding to the keyword is present in the audio input; and performing an action corresponding to a request in the audio input. 18. The non-transitory computer-readable storage of claim 16 , wherein the acoustic information comprises natural language understanding results generated using the audio input.