I

code 443
2025-04-21 17:09:34 +08:00
parent ffc14bcfb2
commit d96bbd4fd5
5 changed files with 949 additions and 0 deletions
@@ -0,0 +1,76 @@
+# Copyright (c) 2024 Bytedance Ltd. and/or its affiliates
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+def find_phrase_positions_in_text(text, phrase):
+    """
+    Return the position of the first character of the phrase in the text.
+    """
+    
+    position = -1
+    positions = []
+    while True:
+        position = text.find(phrase, position + 1)
+        if position == -1:
+            break
+        positions.append(position)
+    return positions
+
+def classifier_free_guidance_image_prompt_cascade(
+    pred_t_cond, pred_ti_cond, pred_uncond, guidance_weight_t=7.5, guidance_weight_i=7.5, 
+    guidance_stdev_rescale_factor=0.7, cfg_rescale_mode="none", super_cross_mask=None
+    ):
+
+    if cfg_rescale_mode == "none":
+        pred = pred_uncond + guidance_weight_t * (pred_t_cond - pred_uncond) + guidance_weight_i * (pred_ti_cond - pred_t_cond)
+    elif cfg_rescale_mode == "none_direct":
+        pred = pred_uncond + guidance_weight_i * (pred_ti_cond - pred_uncond)
+    elif cfg_rescale_mode == "naive":
+        assert super_cross_mask is not None
+        pred_std_t_before = pred_t_cond.std([1, 2, 3], keepdim=True)
+        pred_std_ti_before = pred_ti_cond.std([1, 2, 3], keepdim=True)
+
+        pred = pred_uncond + guidance_weight_t * (pred_t_cond - pred_uncond) + guidance_weight_i * (pred_ti_cond - pred_t_cond)
+
+        pred_std_after = pred.std([1, 2, 3], keepdim=True)
+
+        pred_rescale_t_factor = guidance_stdev_rescale_factor * (pred_std_t_before / pred_std_after) + (1 - guidance_stdev_rescale_factor)
+        pred_rescale_ti_factor = guidance_stdev_rescale_factor * (pred_std_ti_before / pred_std_after) + (1 - guidance_stdev_rescale_factor)
+
+        pred_ti = pred * super_cross_mask
+        pred_t = pred * (1 - super_cross_mask)
+        pred = pred_ti * pred_rescale_ti_factor + pred_t * pred_rescale_t_factor
+    elif cfg_rescale_mode == "naive_global":
+        pred_std_ti_before = pred_ti_cond.std([1, 2, 3], keepdim=True)
+
+        pred = pred_uncond + guidance_weight_t * (pred_t_cond - pred_uncond) + guidance_weight_i * (pred_ti_cond - pred_t_cond)
+
+        pred_std_after = pred.std([1, 2, 3], keepdim=True)
+
+        pred_rescale_ti_factor = guidance_stdev_rescale_factor * (pred_std_ti_before / pred_std_after) + (1 - guidance_stdev_rescale_factor)
+
+        pred = pred * pred_rescale_ti_factor
+    elif cfg_rescale_mode == "naive_global_direct":
+        pred_std_ti_before = pred_ti_cond.std([1, 2, 3], keepdim=True)
+
+        pred = pred_uncond + guidance_weight_i * (pred_ti_cond - pred_uncond)
+
+        pred_std_after = pred.std([1, 2, 3], keepdim=True)
+
+        pred_rescale_ti_factor = guidance_stdev_rescale_factor * (pred_std_ti_before / pred_std_after) + (1 - guidance_stdev_rescale_factor)
+
+        pred = pred * pred_rescale_ti_factor
+    else:
+        raise NotImplementedError()
+
+    return pred