[Misc] Add example for LLaVA-NeXT (#5879)

examples/llava_next_example.py

+from io import BytesIO
+
+import requests
+from PIL import Image
+
+from vllm import LLM, SamplingParams
+from vllm.multimodal.image import ImagePixelData
+
+# Dynamic image input is currently not supported and therefore
+# a fixed image input shape and its corresponding feature size is required.
+# See https://github.com/vllm-project/vllm/pull/4199 for the complete
+# configuration matrix.
+
+llm = LLM(
+    model="llava-hf/llava-v1.6-mistral-7b-hf",
+    image_input_type="pixel_values",
+    image_token_id=32000,
+    image_input_shape="1,3,336,336",
+    image_feature_size=1176,
+)
+
+prompt = "[INST] " + "<image>" * 1176 + "\nWhat is shown in this image? [/INST]"
+url = "https://h2o-release.s3.amazonaws.com/h2ogpt/bigben.jpg"
+image = Image.open(BytesIO(requests.get(url).content))
+sampling_params = SamplingParams(temperature=0.8, top_p=0.95, max_tokens=100)
+
+outputs = llm.generate(
+    {
+        "prompt": prompt,
+        "multi_modal_data": ImagePixelData(image),
+    },
+    sampling_params=sampling_params)
+
+generated_text = ""
+for o in outputs:
+    generated_text += o.outputs[0].text
+
+print(f"LLM output:{generated_text}")