"""MiniMax-H3 `t2va` / `fl2va`, split deployment — the denoising half.""" from __future__ import annotations import os import tempfile import time import traceback from functools import cache # Before anything that could initialize CUDA: `import spaces` patches `torch.cuda` so the 72 GiB load can happen at # startup rather than on GPU time. import spaces from fastapi.responses import HTMLResponse from gradio import Request, Server from gradio.data_classes import FileData MODEL_REPO = os.environ.get("H3_MODEL_REPO", "MiniMaxAI/MiniMax-H3") CONDITIONER_SPACE = os.environ.get("H3_CONDITIONER", "multimodalart/qwen3vl-conditioner") # `pack` places the transformer at startup, `lazy` moves everything on the first GPU call, `offload` hands placement to # `ComponentsManager.enable_auto_cpu_offload`. PLACEMENT = os.environ.get("H3_PLACEMENT", "pack").lower() # cuDNN's fused attention is 10-20% faster than the SDPA default on this pool and needs nothing installed. ATTENTION = os.environ.get("H3_ATTENTION", "_native_cudnn").lower() GPU_SIZE = os.environ.get("H3_GPU_SIZE", "xlarge") # Must stay identical to the conditioner's table: the *label* goes over the wire, so a canvas that half does not know # is rejected there and surfaces as a failure here. CANVASES = { # 16:9 "960x544 · 16:9 fast": (544, 960), "1024x576 · 16:9 fast": (576, 1024), "1152x640 · 16:9": (640, 1152), "1280x704 · 16:9": (704, 1280), "1344x768 · 16:9 full": (768, 1344), # 9:16 "544x960 · 9:16 fast": (960, 544), "640x1152 · 9:16": (1152, 640), "768x1344 · 9:16 full": (1344, 768), # 1:1 "544x544 · 1:1 fast": (544, 544), "768x768 · 1:1 full": (768, 768), # 4:3 / 3:4 "768x576 · 4:3 fast": (576, 768), "1024x768 · 4:3 full": (768, 1024), "576x768 · 3:4 fast": (768, 576), "768x1024 · 3:4 full": (1024, 768), # 21:9 "1152x512 · 21:9 fast": (512, 1152), "1536x672 · 21:9 full": (672, 1536), } DEFAULT_CANVAS = "960x544 · 16:9 fast" FPS, FRAMES_PER_CHUNK, LATENTS_PER_CHUNK = 24, 17, 5 # It is the *snapped* frame count the ceiling has to hold for: 15 s is 360 frames, which rounds up to 362, i.e. # 15.083 s, and is refused. MIN_UI_DURATION, MAX_UI_DURATION = 2, 14 def snap_frames(seconds: float) -> int: """The frame count MiniMax-H3's video VAE can decode: the next `17 * n + 5` at 24 fps.""" frames = max(1, round(float(seconds) * FPS)) while frames % FRAMES_PER_CHUNK != LATENTS_PER_CHUNK: frames += 1 return frames def lower_duration_floor(seconds: float = MIN_UI_DURATION) -> None: """Let the pipeline generate below its 5 s floor. 56 frames (2.33 s) is fine on the released checkpoint.""" from diffusers.modular_pipelines.minimax_h3.modular_pipeline import MiniMaxH3ModularPipeline MiniMaxH3ModularPipeline.min_duration = property(lambda self: float(seconds)) OUTPUT_DIR = os.path.join(tempfile.gettempdir(), "h3-outputs") PIPE = None MANAGER = None LOAD_ERROR: str | None = None LOADED_IN: float | None = None LORA_STATUS: str | None = None def status() -> str: if LOAD_ERROR: return LOAD_ERROR if PIPE is None: return f"Loading `{MODEL_REPO}` (transformer + VAEs, 77.3 GB). Watch the Space logs." import h3_aoti return ( f"Ready · transformer + VAEs **bfloat16, unquantized** · placement `{PLACEMENT}` · attention `{ATTENTION}` · " f"{h3_aoti.status()} · {LORA_STATUS or 'no LoRA'} · loaded in {LOADED_IN:.0f}s · " f"conditioner `{CONDITIONER_SPACE}`" ) def load_models() -> str | None: """Load the denoising half at startup. `MiniMaxH3GeneratorBlocks` declares `transformer`, `vae`, `audio_vae`, the two schedulers and `video_processor`, so `load_components` fetches exactly those subfolders — `text_encoder/` and `transformer_ref/` are never touched. Both autoencoders carry `_keep_in_fp32_modules` over every module and stay float32: a bfloat16 audio VAE decodes the soundtrack roughly 20 dB too quiet. """ global PIPE, MANAGER, LOAD_ERROR, LOADED_IN, LORA_STATUS if PIPE is not None or LOAD_ERROR is not None: return LOAD_ERROR started = time.time() try: import torch from diffusers import ComponentsManager from h3_split_blocks import MiniMaxH3GeneratorBlocks lower_duration_floor() manager = ComponentsManager() blocks = MiniMaxH3GeneratorBlocks() print(f"[gen] loading {[c.name for c in blocks.expected_components]} from {MODEL_REPO} ...", flush=True) pipe = blocks.init_pipeline(MODEL_REPO, components_manager=manager, collection="h3") pipe.load_components(dtype=torch.bfloat16) # Fold the 4-step Turbo LoRA into the bf16 weights before AoTI packages the blocks, so the compiled forward # reads weights that already carry the update. `H3_LORA=off` disables. import h3_lora LORA_STATUS = h3_lora.apply_lora(pipe.transformer) if LORA_STATUS: print(f"[gen] {LORA_STATUS}", flush=True) pipe.transformer.set_attention_backend(ATTENTION) # Still startup, still free: an AoTI package carries no weights and opens its archive lazily inside the GPU # worker. Off unless `H3_AOTI=1`. import h3_aoti h3_aoti.maybe_load(pipe.transformer) if PLACEMENT == "pack": # Scoped to the transformer. `spaces` packs every startup-resident CUDA tensor into a second on-disk copy, # and packing all 77.3 GB busts the 150 GB storage quota; the 61.7 GB transformer alone fits. The ~10 GB of # fp32 VAEs move on the first GPU call instead. pipe.transformer.to("cuda") if PLACEMENT == "offload": manager.enable_auto_cpu_offload(device="cuda") _arm_decode_hooks(pipe) PIPE, MANAGER = pipe, manager LOADED_IN = time.time() - started print(f"[gen] ready in {LOADED_IN:.0f}s", flush=True) except Exception as error: traceback.print_exc() LOAD_ERROR = f"**Loading `{MODEL_REPO}` failed** after {time.time() - started:.0f}s: `{type(error).__name__}: {error}`" return LOAD_ERROR def _arm_decode_hooks(pipe): """Make the offload hooks fire for the two VAEs. `enable_auto_cpu_offload` wraps `forward`, and the decode blocks call `vae.decode(...)` directly, so the hook never runs and the VAE is still on the host when the latents arrive on the card. """ for name in ("vae", "audio_vae"): module = getattr(pipe, name) inner = module.decode def armed(*args, _module=module, _decode=inner, **kwargs): hook = getattr(_module, "_hf_hook", None) if hook is not None: hook.pre_forward(_module) return _decode(*args, **kwargs) module.decode = armed @cache def conditioner(): """The other half, over the gradio API. Used only when the caller's token could not be extracted; the booking is then billed to this Space's pod IP and its small shared quota.""" from gradio_client import Client return Client(CONDITIONER_SPACE) def conditioner_client(ip_token): """A conditioner client billed to the caller. `LocalContext`-based token forwarding is not reliable in Server mode, so the `x-ip-token` header is extracted from the incoming request and passed explicitly (per the gradio ZeroGPU docs); a per-request Client is cheap next to a 45s encode.""" if not ip_token: return conditioner() from gradio_client import Client return Client(CONDITIONER_SPACE, headers={"x-ip-token": ip_token}) def encode_remote(prompt, image_path, last_image_path, canvas, num_frames, rewrite_prompt=False, ip_token=None): """`/encode` on the conditioner Space: a safetensors file holding `prompt_embeds` + `text_token_tags`, with the resolved `height` / `width` / `num_frames` in its metadata, plus the plan. `canvas` is the label.""" from gradio_client import handle_file from safetensors import safe_open path, plan = conditioner_client(ip_token).predict( prompt=prompt, image_path=handle_file(image_path) if image_path else None, last_image_path=handle_file(last_image_path) if last_image_path else None, canvas=canvas, num_frames=num_frames, rewrite_prompt=bool(rewrite_prompt), api_name="/encode", ) with safe_open(path, framework="pt") as handle: metadata = handle.metadata() return handle.get_tensor("prompt_embeds"), handle.get_tensor("text_token_tags"), metadata, plan # Seconds of GPU one request needs, from the packed video rows it is about to denoise: linear in the rows for the # matmuls, quadratic for the attention, against the AoTI block package this Space runs. _DUR_B, _DUR_C = 1.1745e-4, 3.8396e-9 # The two resident decoders and the mux, which scale with the output rather than with the step count. _DECODE_BASE, _DECODE_PER_DEFAULT_CANVAS, _DEFAULT_CANVAS_PIXELS = 15, 15, 960 * 544 * 124 # `pack` mode: only the ~10 GB of VAEs move on a cold worker. _PLACEMENT_ALLOWANCE, _PAD = 12, 10 def get_duration(prompt_embeds, text_token_tags, image, last_image, height, width, num_frames, steps, seed, lora="larry", *a, **k): height, width, num_frames, steps = int(height), int(width), int(num_frames), int(steps) latent_frames = (num_frames - LATENTS_PER_CHUNK) // FRAMES_PER_CHUNK * LATENTS_PER_CHUNK + 2 patches = (height // 32) * (width // 32) rows = latent_frames * patches + (int(image is not None) + int(last_image is not None)) * patches denoise = steps * (_DUR_B * rows + _DUR_C * rows**2) decode = _DECODE_BASE + _DECODE_PER_DEFAULT_CANVAS * (height * width * num_frames) / _DEFAULT_CANVAS_PIXELS return max(60, int(denoise + decode) + _PLACEMENT_ALLOWANCE + _PAD) @spaces.GPU(duration=get_duration, size=GPU_SIZE) def _generate(prompt_embeds, text_token_tags, image, last_image, height, width, num_frames, steps, seed, lora="larry"): """The only thing on GPU time: the packed-sequence denoise loop and the two decoders. Only the three generated outputs come back — a `@spaces.GPU` return crosses a process boundary by pickling, and the full `PipelineState` still holds the packed latents, the rotary grid and the row indices on the card. """ import torch import h3_lora # Fold the requested LoRA in place (a no-op when the state already matches). AoTI blocks read the same # live storage, so the compiled forward carries the switch too. active_lora = h3_lora.set_active(PIPE.transformer, lora) if PLACEMENT == "lazy": PIPE.to("cuda") elif PLACEMENT == "pack": PIPE.vae.to("cuda") PIPE.audio_vae.to("cuda") state = PIPE( prompt_embeds=prompt_embeds.to("cuda"), text_token_tags=text_token_tags, image=image, last_image=last_image, height=height, width=width, num_frames=num_frames, num_inference_steps=int(steps), generator=torch.Generator("cpu").manual_seed(int(seed)), ) return state.get("videos")[0], state.get("audio")[0].cpu(), state.get("sampling_rate"), active_lora def _fit_keyframe(image_path, current_canvas): """Cover-crop an uploaded keyframe to the closest supported aspect ratio and pick that ratio's smallest (fastest) canvas, unless the caller already picked a matching ratio. Returns `(image_path, canvas_label)`.""" from PIL import Image as _Image img = _Image.open(image_path) aspect = img.width / img.height fastest = {} for label, (h, w) in CANVASES.items(): r = w / h if r not in fastest or w * h < fastest[r][1][0] * fastest[r][1][1]: fastest[r] = (label, (h, w)) ratio = min(fastest, key=lambda r: abs(r - aspect)) label, (h, w) = fastest[ratio] cur_h, cur_w = CANVASES[current_canvas] if abs(cur_w / cur_h - aspect) <= abs(ratio - aspect): label = current_canvas h, w = cur_h, cur_w target = w / h if abs(img.width / img.height - target) > 1e-3: if img.width / img.height > target: new_w = int(img.height * target) left = (img.width - new_w) // 2 img = img.crop((left, 0, left + new_w, img.height)) else: new_h = int(img.width / target) top = (img.height - new_h) // 2 img = img.crop((0, top, img.width, top + new_h)) img.save(image_path) return image_path, label def _resolve_lora(lora, use_lora) -> str: """`lora` (`larry` / `lightx` / `off`) wins; the legacy `use_lora` bool maps onto `larry` / `off`.""" if isinstance(lora, str) and lora in ("larry", "lightx", "off"): return lora return "larry" if use_lora else "off" def generate(prompt, image_path=None, last_image_path=None, canvas=DEFAULT_CANVAS, duration=5, steps=6, seed=42, upsample=False, use_lora=True, lora="", ip_token=None): """One request. `upsample`/`use_lora` keep their defaults so a positional API client that predates them is unaffected.""" if LOAD_ERROR: raise Exception(LOAD_ERROR) if PIPE is None: raise Exception("The denoiser is still loading.") if not prompt or not prompt.strip(): raise Exception("MiniMax-H3 always takes a prompt, keyframes or not.") from PIL import Image, ImageOps from diffusers.utils import encode_video lora = _resolve_lora(lora, use_lora) # Server mode: keyframes arrive as FileData dicts, and the cover-crop / canvas-fit that used to be an upload # event in the Blocks UI runs here instead, so API callers get the same treatment. first = image_path["path"] if isinstance(image_path, dict) else image_path last = last_image_path["path"] if isinstance(last_image_path, dict) else last_image_path if first: first, canvas = _fit_keyframe(first, canvas) if last: last, canvas = _fit_keyframe(last, canvas) num_frames = snap_frames(duration) conditioned = time.time() prompt_embeds, text_token_tags, metadata, plan = encode_remote( prompt, first, last, canvas, num_frames, rewrite_prompt=upsample, ip_token=ip_token ) condition_seconds = time.time() - conditioned height, width, num_frames = (int(metadata[key]) for key in ("height", "width", "num_frames")) refined = plan.get("refined_prompt") or "" def keyframe(path): # The conditioning latents encoded here have to be of the image the conditioner looked at, which it prepares # exactly this way. return ImageOps.exif_transpose(Image.open(path)).convert("RGB") if path else None started = time.time() frames, audio, sampling_rate, active_lora = _generate( prompt_embeds, text_token_tags, keyframe(first), keyframe(last), height, width, num_frames, steps, seed, lora, ) generate_seconds = time.time() - started os.makedirs(OUTPUT_DIR, exist_ok=True) path = os.path.join(OUTPUT_DIR, f"h3-{int(time.time() * 1000)}.mp4") encode_video(frames, fps=FPS, output_path=path, audio=audio, audio_sample_rate=sampling_rate) report = ( f"{width}x{height} · {num_frames} frames ({num_frames / FPS:.3f} s) · {int(steps)} steps · " f"conditioner {condition_seconds:.0f}s ({plan['num_text_tokens']} tokens" f"{', upsampled' if refined else ''}) · " f"denoise + decode {generate_seconds:.0f}s ({generate_seconds / int(steps):.1f} s/step) · " f"turbo LoRA {active_lora} · seed {int(seed)}" ) print(f"[gen] {report}", flush=True) return FileData(path=path), report, refined # ====================================================================== # Server mode: Gradio's API engine (queue, SSE, concurrency, ZeroGPU, # gradio_client) under a fully custom studio frontend (index.html). # ====================================================================== app = Server(title="MiniMax-H3 Studio") @app.api(name="generate") def _generate_api(prompt: str, image_path: FileData | None = None, last_image_path: FileData | None = None, canvas: str = DEFAULT_CANVAS, duration: float = 5, steps: int = 6, seed: float = 42, upsample: bool = False, use_lora: bool = True, lora: str = "", request: Request = None) -> tuple[FileData, str, str]: """Generate a video with a synchronized soundtrack. Returns (video, report, refined prompt). `lora` selects the turbo LoRA: `larry` (default), `lightx`, or `off`. The legacy `use_lora` bool still works when `lora` is empty. """ # `request` is injected by the event system, not an API input; its x-ip-token bills the conditioner to the caller. ip_token = request.headers.get("x-ip-token") if request is not None else None return generate(prompt, image_path, last_image_path, canvas, duration, steps, seed, upsample, use_lora, lora, ip_token=ip_token) @app.get("/status") def studio_status(): """Polled by the frontend: is the denoiser ready, and the human-readable status line.""" return {"ready": PIPE is not None and LOAD_ERROR is None, "status": status()} # NB: not `/config` — Gradio's own client-discovery route lives there and shadowing it breaks `@gradio/client`. @app.get("/studio-config") def studio_config(): """The canvas table and slider ranges, so the frontend never hardcodes a label the backend would reject.""" import h3_lora state = getattr(PIPE.transformer, "_lora_state", None) if PIPE is not None else None sets = state["sets"] if state else {} return { "canvases": list(CANVASES), "default_canvas": DEFAULT_CANVAS, "min_duration": MIN_UI_DURATION, "max_duration": MAX_UI_DURATION, # The LoRA dropdown: value -> {label, suggested steps}. "loras": { **{ name: {"label": spec["label"], "steps": {"larry": 6, "lightx": 4}.get(name, 6)} for name, spec in sets.items() }, "off": {"label": "off (base model)", "steps": 28}, }, "default_lora": state["active"] if state else "off", } @app.get("/", response_class=HTMLResponse) def homepage(): with open(os.path.join(os.path.dirname(os.path.abspath(__file__)), "index.html"), encoding="utf-8") as f: return f.read() load_models() if __name__ == "__main__": # allowed_paths: the /gradio_api/file= route only serves whitelisted directories. app.launch(show_error=True, allowed_paths=[OUTPUT_DIR])