better init image handling

scripts/img2img.py

@@ -1,6 +1,7 @@
 """make variations of input image"""
 
 import argparse, os, sys, glob
+import PIL
 import torch
 import numpy as np
 from omegaconf import OmegaConf
@@ -9,6 +10,8 @@ from tqdm import tqdm, trange
 from itertools import islice
 from einops import rearrange, repeat
 from torchvision.utils import make_grid
+from torch import autocast
+from contextlib import nullcontext
 import time
 from pytorch_lightning import seed_everything
 
@@ -43,8 +46,12 @@ def load_model_from_config(config, ckpt, verbose=False):
 
 
 def load_img(path):
-    image = np.array(Image.open(path).convert("RGB"))
-    image = image.astype(np.float32) / 255.0
+    image = Image.open(path).convert("RGB")
+    w, h = image.size
+    print(f"loaded input image of size ({w}, {h}) from {path}")
+    w, h = map(lambda x: x - x % 32, (w, h))  # resize to integer multiple of 32
+    image = image.resize((w, h), resample=PIL.Image.LANCZOS)
+    image = np.array(image).astype(np.float32) / 255.0
     image = image[None].transpose(0, 3, 1, 2)
     image = torch.from_numpy(image)
     return 2.*image - 1.
@@ -119,20 +126,6 @@ def main():
         help="sample this often",
     )
 
-    parser.add_argument(
-        "--H",
-        type=int,
-        default=256,
-        help="image height, in pixel space",
-    )
-
-    parser.add_argument(
-        "--W",
-        type=int,
-        default=256,
-        help="image width, in pixel space",
-    )
-
     parser.add_argument(
         "--C",
         type=int,
@@ -149,7 +142,7 @@ def main():
     parser.add_argument(
         "--n_samples",
         type=int,
-        default=8,
+        default=2,
         help="how many samples to produce for each given prompt. A.k.a batch size",
     )
 
@@ -170,7 +163,7 @@ def main():
     parser.add_argument(
         "--strength",
         type=float,
-        default=0.3,
+        default=0.75,
         help="strength for noising/unnoising. 1.0 corresponds to full destruction of information in init image",
     )
 
@@ -197,6 +190,14 @@ def main():
         default=42,
         help="the seed (for reproducible sampling)",
     )
+    parser.add_argument(
+        "--precision",
+        type=str,
+        help="evaluate at this precision",
+        choices=["full", "autocast"],
+        default="autocast"
+    )
+
     opt = parser.parse_args()
     seed_everything(opt.seed)
 
@@ -244,7 +245,9 @@ def main():
     t_enc = int(opt.strength * opt.ddim_steps)
     print(f"target t_enc is {t_enc} steps")
 
+    precision_scope = autocast if opt.precision == "autocast" else nullcontext
     with torch.no_grad():
+        with precision_scope("cuda"):
             with model.ema_scope():
                 tic = time.time()
                 all_samples = list()
@@ -288,7 +291,7 @@ def main():
                 toc = time.time()
 
     print(f"Your samples are ready and waiting for you here: \n{outpath} \n"
-          f"Sampling took {toc - tic}s, i.e. produced {opt.n_iter * opt.n_samples / (toc - tic):.2f} samples/sec."
+          f"Sampling took {toc - tic}s, i.e., produced {opt.n_iter * opt.n_samples / (toc - tic):.2f} samples/sec."
           f" \nEnjoy.")