How do I fix `Rate limit exceeded` errors when logging metrics?

If you receive an HTTP 429 Rate limit exceeded error when calling wandb.log(), you are exceeding the rate limit quota for your project. W&B applies rate limits per project, and paid plans have higher limits than free plans.

How to stay under the rate limit

1. Update your W&B SDK: The latest version includes optimized mechanisms for retrying requests and managing quota usage.

   pip install --upgrade wandb
   

2. Reduce logging frequency: Log metrics less often. For example, log every N epochs instead of every epoch:

   for epoch in range(100):
       if epoch % 5 == 0:
           wandb.log({"acc": accuracy, "loss": loss})
   

3. Sync data manually: If you are rate limited, W&B stores your run data locally. You can sync it later with:

   wandb sync <run-file-path>
   

Rate limit headers

When rate limited, the response includes these headers:

Header	Description
RateLimit-Remaining	Quota remaining in the current window (0–1000 scale)
RateLimit-Reset	Seconds until the current quota resets

If RateLimit-Remaining is 0, wait for the number of seconds in RateLimit-Reset before retrying.

For more information, see Experiments limits and performance.

---

Metrics Experiments