Run External Model

About this capability

• For a kind of model no other action covers (separating a song's stems, aligning words to audio, depth or segmentation maps, a published fine-tune). A model the catalog has is run with its own action
• `replicate.model` is `owner/name:version`. Call `describeExternalModel` first: it returns the model pinned to its latest version, its input and output schemas, its licence and its price
• `replicate.input` is the model's own input, passed through as given. A file input is a URL; a private file of the app's own is signed for the run
• `output` is whatever the model returns. Its files are copied before Replicate deletes them, an hour after the run: into the store passed as `store`, or onto the public CDN without one, so pass a private store for anything confidential
• Billed for the seconds the model ran (`runSeconds`), at the model's own per-second price. A cold start is waited for and not billed, and can take minutes on a model that hasn't run lately: `timeoutSeconds` covers the wait and the run together
• A run that fails throws with the model's own error. One that passes `timeoutSeconds` is cancelled and throws `external_model_timed_out`
• Models Replicate maintains itself ("official" models) and private models are refused. Each model's licence is its author's: `describeExternalModel` links it

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