Add notebook to reproduce PAIBench-G and RBench generations with JSON prompts

evaluation/paibench_g/README.md

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+<!-- SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+SPDX-License-Identifier: OpenMDW-1.1 -->
+
+# Cosmos3 PAI-Bench (Generation) Reproduction
+
+End-to-end recipe for generating the PAI-Bench (Physical AI Bench) generation
+set with Cosmos3-Super using the native Cosmos Framework PyTorch entrypoint
+(`python -m cosmos_framework.scripts.inference`).
+
+PAI-Bench covers Physical AI domains (AV driving, robotics, industry, physics,
+human, common sense) across 1044 samples. The notebook runs both generation
+tasks:
+
+- **Text-to-Video (T2V)**: generate from the prompt only (no condition image);
+  generate 189 frames.
+- **Image-to-Video (I2V)**: condition on the per-sample image
+  (`condition_image/<image_name>`); generate 189 frames.
+
+Both tasks generate at 24 FPS, 720p, 16:9, and keep the raw output (no staging).
+
+## Files
+
+- `run_with_cosmos_framework.ipynb` — main notebook (demos for both tasks + two full-sweep cells).
+- `assets/i2v_prompts.json` — 1044 I2V entries with `json_upsampled_prompt` and `negative_prompt`.
+- `assets/t2v_prompts.json` — 1044 T2V entries with `json_upsampled_prompt` and `negative_prompt`.
+
+## Dataset
+
+The condition images come from the Hugging Face dataset
+[`shi-labs/physical-ai-bench-generation`](https://huggingface.co/datasets/shi-labs/physical-ai-bench-generation),
+cloned via `git clone` (Git LFS). Only the condition images are read from the
+dataset; the prompts come from the local `assets/` files.
+
+## Sampling settings
+
+| Setting     | Value         |
+| ----------- | ------------: |
+| num_frames  |           189 |
+| fps         |            24 |
+| resolution  |           720 |
+| num_steps   |            50 |
+| guidance    |           6.0 |
+| shift       |          10.0 |
+| seed        |             0 |
+
+## Requirements
+
+- 4-GPU Linux node (configurable via `COSMOS3_NUM_GPUS`, default 4)
+- `uv >= 0.11.3`
+- `git`, `git-lfs`
+- Hugging Face access to the Cosmos3 model family