# tinker_cookbook.eval

| Class                                                                                                                             | Description                                                                  |
| --------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------- |
| [`TrainingClientEvaluator`](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/eval/trainingclientevaluator/index.md) | An evaluator that uses a TrainingClient to compute metrics (e.g., loss).     |
| [`SamplingClientEvaluator`](https://tinker-docs.thinkingmachines.ai/cookbook/api-reference/eval/samplingclientevaluator/index.md) | An evaluator that uses a SamplingClient to compute metrics (e.g., accuracy). |