docs: add info on running offline to FAQ (#555)

Added FAQ section on offline usage with guidance for configuring local
caching and pre-populating data

---------

Signed-off-by: Marta Stepniewska-Dziubinska <[email protected]>

Author: marta-sd

docs/references/faq.md

@@ -318,3 +318,25 @@ nemo-evaluator-launcher run --config-name your_config --dry-run
 ```
 
 Reference: {ref}`configuration-overview`.
+
+---
+
+## **Can I use Evaluator without internet access?**
+
+Yes. NeMo Evaluator uses datasets and model checkpoints from [Hugging Face Hub](https://huggingface.co/docs/hub/en/index). If a requested dataset or model is not available locally, it is downloaded from the Hub at runtime.
+
+When working in an environment without internet access, configure a cache directory and pre-populate it with all required data before launching the evaluation.
+
+See the [example configuration](https://github.com/NVIDIA-NeMo/Evaluator/blob/main/packages/nemo-evaluator-launcher/examples/slurm_vllm_advanced_hf_caching.yaml) with HF caching:
+
+```{literalinclude} ../../packages/nemo-evaluator-launcher/examples/slurm_vllm_advanced_hf_caching.yaml
+:language: yaml
+:start-after: "# [docs-start-snippet]"
+:end-before: "# [docs-end-snippet]"
+```
+
+Modify the example with actual paths for the mounts and run:
+
+```bash
+nemo-evaluator-launcher run --config packages/nemo-evaluator-launcher/examples/slurm_vllm_advanced_hf_caching.yaml
+```

packages/nemo-evaluator-launcher/examples/slurm_vllm_advanced_hf_caching.yaml

@@ -31,6 +31,7 @@
 #     Results from such test runs should NEVER be used to compare models or
 #     report benchmark performance.
 
+# [docs-start-snippet]
 defaults:
   - execution: slurm/default
   - deployment: vllm
@@ -81,3 +82,5 @@ evaluation:
   tasks:
     - name: ifeval  # chat benchmark will automatically use v1/chat/completions endpoint
     - name: gsm8k   # completions benchmark will automatically use v1/completions endpoint
+
+# [docs-end-snippet]