{
 "cells": [
  {
   "cell_type": "markdown",
   "source": [
    "### 🚀 For an interactive experience, head over to our [demo platform](https://var.vision/demo) and dive right in! 🌟"
   ],
   "metadata": {
    "collapsed": false
   }
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "outputs": [],
   "source": [
    "################## 1. Download checkpoints and build models\n",
    "import os\n",
    "import os.path as osp\n",
    "import torch, torchvision\n",
    "import random\n",
    "import numpy as np\n",
    "import PIL.Image as PImage, PIL.ImageDraw as PImageDraw\n",
    "setattr(torch.nn.Linear, 'reset_parameters', lambda self: None)     # disable default parameter init for faster speed\n",
    "setattr(torch.nn.LayerNorm, 'reset_parameters', lambda self: None)  # disable default parameter init for faster speed\n",
    "from models import VQVAE, build_vae_var\n",
    "\n",
    "MODEL_DEPTH = 16    # TODO: =====> please specify MODEL_DEPTH <=====\n",
    "assert MODEL_DEPTH in {16, 20, 24, 30}\n",
    "\n",
    "\n",
    "# download checkpoint\n",
    "hf_home = 'https://huggingface.co/FoundationVision/var/resolve/main'\n",
    "vae_ckpt, var_ckpt = 'vae_ch160v4096z32.pth', f'var_d{MODEL_DEPTH}.pth'\n",
    "if not osp.exists(vae_ckpt): os.system(f'wget {hf_home}/{vae_ckpt}')\n",
    "if not osp.exists(var_ckpt): os.system(f'wget {hf_home}/{var_ckpt}')\n",
    "\n",
    "# build vae, var\n",
    "patch_nums = (1, 2, 3, 4, 5, 6, 8, 10, 13, 16)\n",
    "device = 'cuda' if torch.cuda.is_available() else 'cpu'\n",
    "if 'vae' not in globals() or 'var' not in globals():\n",
    "    vae, var = build_vae_var(\n",
    "        V=4096, Cvae=32, ch=160, share_quant_resi=4,    # hard-coded VQVAE hyperparameters\n",
    "        device=device, patch_nums=patch_nums,\n",
    "        num_classes=1000, depth=MODEL_DEPTH, shared_aln=False,\n",
    "    )\n",
    "\n",
    "# load checkpoints\n",
    "vae.load_state_dict(torch.load(vae_ckpt, map_location='cpu'), strict=True)\n",
    "var.load_state_dict(torch.load(var_ckpt, map_location='cpu'), strict=True)\n",
    "vae.eval(), var.eval()\n",
    "for p in vae.parameters(): p.requires_grad_(False)\n",
    "for p in var.parameters(): p.requires_grad_(False)\n",
    "print(f'prepare finished.')"
   ],
   "metadata": {
    "collapsed": false,
    "is_executing": true
   }
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "outputs": [],
   "source": [
    "############################# 2. Sample with classifier-free guidance\n",
    "\n",
    "# set args\n",
    "seed = 0 #@param {type:\"number\"}\n",
    "torch.manual_seed(seed)\n",
    "num_sampling_steps = 250 #@param {type:\"slider\", min:0, max:1000, step:1}\n",
    "cfg = 4 #@param {type:\"slider\", min:1, max:10, step:0.1}\n",
    "class_labels = (980, 980, 437, 437, 22, 22, 562, 562)  #@param {type:\"raw\"}\n",
    "more_smooth = False # True for more smooth output\n",
    "\n",
    "# seed\n",
    "torch.manual_seed(seed)\n",
    "random.seed(seed)\n",
    "np.random.seed(seed)\n",
    "torch.backends.cudnn.deterministic = True\n",
    "torch.backends.cudnn.benchmark = False\n",
    "\n",
    "# run faster\n",
    "tf32 = True\n",
    "torch.backends.cudnn.allow_tf32 = bool(tf32)\n",
    "torch.backends.cuda.matmul.allow_tf32 = bool(tf32)\n",
    "torch.set_float32_matmul_precision('high' if tf32 else 'highest')\n",
    "\n",
    "# sample\n",
    "B = len(class_labels)\n",
    "label_B: torch.LongTensor = torch.tensor(class_labels, device=device)\n",
    "with torch.inference_mode():\n",
    "    with torch.autocast('cuda', enabled=True, dtype=torch.float16, cache_enabled=True):    # using bfloat16 can be faster\n",
    "        recon_B3HW = var.autoregressive_infer_cfg(B=B, label_B=label_B, cfg=cfg, top_k=900, top_p=0.95, g_seed=seed, more_smooth=more_smooth)\n",
    "\n",
    "chw = torchvision.utils.make_grid(recon_B3HW, nrow=8, padding=0, pad_value=1.0)\n",
    "chw = chw.permute(1, 2, 0).mul_(255).cpu().numpy()\n",
    "chw = PImage.fromarray(chw.astype(np.uint8))\n",
    "chw.show()\n"
   ],
   "metadata": {
    "collapsed": false
   }
  }
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