Update README to enhance task listing and provide usage instructions …

…for MixEval-X

lmms_eval/tasks/mix_evals/README.md

@@ -4,7 +4,7 @@
 
 ## Usage
 
-Tasks:
+Here is the list of tasks in MixEval-X:
 
 ```
 mix_evals_image2text
@@ -25,8 +25,28 @@ mix_evals_audio2text_hard
  └── mix_evals_audio2text_freeform_hard
 ```
 
+You can run the command:
+
+```bash
+lmms-eval   --model=<MODEL> \
+            --model_args=<MODEL_ARGS> \
+            --tasks=<TASK> \
+            --batch_size=1 \
+            --log_samples \
+            --output_path=./logs/
+```
+
+Models are listed at [here](https://github.com/EvolvingLMMs-Lab/lmms-eval/blob/0589d0fba2efbcb526321f23ab0587599fd3c4c9/lmms_eval/models/__init__.py#L13).
+
+For example, to evaluate `llava_vid` on `mix_evals_video2text` (including `mix_evals_video2text_freeform` and `mix_evals_video2text_mc`):
+
 ```bash
-lmms-eval --model=llava_vid --model_args=pretrained=lmms-lab/LLaVA-NeXT-Video-7B --tasks=mix_evals_video2text --batch_size=1 --log_samples --output_path=./logs/
+lmms-eval   --model=llava_vid \
+            --model_args=pretrained=lmms-lab/LLaVA-NeXT-Video-7B \
+            --tasks=mix_evals_video2text \
+            --batch_size=1 \
+            --log_samples \
+            --output_path=./logs/
 ```
 
 ## Citation