[Model] Add HSDP support for LTX-2 (#2899)

Signed-off-by: hanzheli <hanzheli@kuaishou.com>
Signed-off-by: fywc <hanzheli@kuaishou.com>

docs/user_guide/diffusion_features.md

@@ -140,7 +140,7 @@ The following tables show which models support each feature:
 |-------|:----------:|:-----------:|:---------------------:|:--------------:|:-----------------:|:------:|:------------------------:|:--------------------:|:--------------:|:----------------:|
 | **Wan2.2** | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ (encode/decode) | ❌ | ❌ |
 | **Wan2.1-VACE** | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ (decode) | ❌ | ❌ |
-| **LTX-2** | ❌ | ✅ | ✅ | ✅ | ✅ | ❌ | ✅ | ❌ | ❌ | ❌ |
+| **LTX-2** | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ❌ |
 | **Helios** | ❌ | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ | ❌ | ❌ | ❌ |
 | **HunyuanVideo-1.5 T2V I2V** | ❌ | ✅ | ❌ | ✅ | ✅ | ✅ | ✅ | ✅ (decode) | ✅ | ❌ |
 | **DreamID-Omni** | ❌ | ❌ | ❌ | ✅ | ❌ | ❌ | ✅ | ❌ | ❌ | ❌ |

docs/user_guide/examples/online_serving/text_to_video.md

@@ -288,6 +288,14 @@ vllm serve Lightricks/LTX-2 --omni --port 8098 \
     --enforce-eager --flow-shift 1.0 --boundary-ratio 1.0
 ```
 
+For multi-GPU memory reduction, you can enable HSDP:
+
+```bash
+vllm serve Lightricks/LTX-2 --omni --port 8098 \
+    --enforce-eager --flow-shift 1.0 --boundary-ratio 1.0 \
+    --use-hsdp --hsdp-shard-size 2
+```
+
 #### Start with Optimization Presets
 
 Use the LTX-2 startup script with built-in optimization presets: