Add bucketing metadata

library/train_util.py

@@ -85,6 +85,7 @@ class BaseDataset(torch.utils.data.Dataset):
     self.enable_bucket = False
     self.min_bucket_reso = None
     self.max_bucket_reso = None
+    self.bucket_info = None
 
     self.tokenizer_max_length = self.tokenizer.model_max_length if max_token_length is None else max_token_length + 2
 
@@ -217,9 +218,12 @@ class BaseDataset(torch.utils.data.Dataset):
         self.buckets[bucket_index].append(image_info.image_key)
 
     if self.enable_bucket:
+      self.bucket_info = {"buckets": {}}
       print("number of images (including repeats) / 各bucketの画像枚数（繰り返し回数を含む）")
       for i, (reso, img_keys) in enumerate(zip(bucket_resos, self.buckets)):
+        self.bucket_info["buckets"][i] = {"resolution": reso, "count": len(img_keys)}
         print(f"bucket {i}: resolution {reso}, count: {len(img_keys)}")
+      self.bucket_info["img_ar_errors"] = img_ar_errors
       img_ar_errors = np.array(img_ar_errors)
       print(f"mean ar error (without repeats): {np.mean(np.abs(img_ar_errors))}")