# Train Model

## Train Model

> Triggers training for the specified forecast model. The model must have demand data uploaded and be in a state that allows training (e.g. \`ready\` or \`created\` with demand data).\
> \
> Training runs asynchronously — poll the model's \`readiness.status\` field to monitor progress.

```json
{"openapi":"3.1.0","info":{"title":"PredictHQ Forecasts API (Public Preview)","version":"1.0.0"},"tags":[{"name":"Models"}],"servers":[{"url":"https://api.predicthq.com"}],"security":[{"BearerAuth":[]}],"components":{"securitySchemes":{"BearerAuth":{"type":"http","scheme":"bearer","bearerFormat":"$API_KEY","description":"Enter your PredictHQ API key. The Bearer prefix is added automatically.\n\nWhen calling the API directly, send: `Authorization: Bearer <YOUR_API_KEY>` as documented at [https://docs.predicthq.com/api/overview/authenticating](https://docs.predicthq.com/api/overview/authenticating)\n"}},"schemas":{"ErrorResponse":{"type":"object","properties":{"error":{"description":"Error message","type":"string","title":"Error"}},"required":["error"],"title":"ErrorResponse"}}},"paths":{"/v1/forecasts/models/{model_id}/train":{"post":{"operationId":"train_model","summary":"Train Model","description":"Triggers training for the specified forecast model. The model must have demand data uploaded and be in a state that allows training (e.g. `ready` or `created` with demand data).\n\nTraining runs asynchronously — poll the model's `readiness.status` field to monitor progress.","parameters":[{"name":"model_id","in":"path","description":"The unique identifier of the forecast model.","required":true,"schema":{"type":"string","title":"Model Id"}}],"responses":{"204":{"description":"Successful Response"},"400":{"description":"Bad Request","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"401":{"description":"Unauthorized","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"402":{"description":"Payment Required","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"403":{"description":"Forbidden","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}},"404":{"description":"Not Found","content":{"application/json":{"schema":{"$ref":"#/components/schemas/ErrorResponse"}}}}},"tags":["Models"]}}}}
```

## OpenAPI Spec

The OpenAPI spec for Forecasts API can be [found here](https://api.predicthq.com/docs/?urls.primaryName=Forecasts+API).

## Guides

* [Getting Started with Forecasts API](https://docs.predicthq.com/getting-started/guides/forecasts-api-guides/getting-started)
* [Understanding Forecast Accuracy Metrics](https://docs.predicthq.com/getting-started/guides/forecasts-api-guides/understanding-forecast-accuracy-metrics)
* [Troubleshooting Guide for Forecasts API](https://docs.predicthq.com/getting-started/guides/forecasts-api-guides/troubleshooting)


---

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