Allow SD attend and excite pipeline to work with any size output images (#2835)

Allow stable diffusion attend and excite pipeline to work with any size output image. Re: #2476, #2603

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion_attend_and_excite.py

@@ -14,7 +14,7 @@
 
 import inspect
 import math
-from typing import Any, Callable, Dict, List, Optional, Union
+from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
 import numpy as np
 import torch
@@ -76,7 +76,7 @@ class AttentionStore:
 
     def __call__(self, attn, is_cross: bool, place_in_unet: str):
         if self.cur_att_layer >= 0 and is_cross:
-            if attn.shape[1] == self.attn_res**2:
+            if attn.shape[1] == np.prod(self.attn_res):
                 self.step_store[place_in_unet].append(attn)
 
         self.cur_att_layer += 1
@@ -98,7 +98,7 @@ class AttentionStore:
         attention_maps = self.get_average_attention()
         for location in from_where:
             for item in attention_maps[location]:
-                cross_maps = item.reshape(-1, self.attn_res, self.attn_res, item.shape[-1])
+                cross_maps = item.reshape(-1, self.attn_res[0], self.attn_res[1], item.shape[-1])
                 out.append(cross_maps)
         out = torch.cat(out, dim=0)
         out = out.sum(0) / out.shape[0]
@@ -109,7 +109,7 @@ class AttentionStore:
         self.step_store = self.get_empty_store()
         self.attention_store = {}
 
-    def __init__(self, attn_res=16):
+    def __init__(self, attn_res):
         """
         Initialize an empty AttentionStore :param step_index: used to visualize only a specific step in the diffusion
         process
@@ -724,7 +724,7 @@ class StableDiffusionAttendAndExcitePipeline(DiffusionPipeline, TextualInversion
         max_iter_to_alter: int = 25,
         thresholds: dict = {0: 0.05, 10: 0.5, 20: 0.8},
         scale_factor: int = 20,
-        attn_res: int = 16,
+        attn_res: Optional[Tuple[int]] = None,
     ):
         r"""
         Function invoked when calling the pipeline for generation.
@@ -796,8 +796,8 @@ class StableDiffusionAttendAndExcitePipeline(DiffusionPipeline, TextualInversion
                 Dictionary defining the iterations and desired thresholds to apply iterative latent refinement in.
             scale_factor (`int`, *optional*, default to 20):
                 Scale factor that controls the step size of each Attend and Excite update.
-            attn_res (`int`, *optional*, default to 16):
-                The resolution of most semantic attention map.
+            attn_res (`tuple`, *optional*, default computed from width and height):
+                The 2D resolution of the semantic attention map.
 
         Examples:
 
@@ -870,7 +870,9 @@ class StableDiffusionAttendAndExcitePipeline(DiffusionPipeline, TextualInversion
         # 6. Prepare extra step kwargs. TODO: Logic should ideally just be moved out of the pipeline
         extra_step_kwargs = self.prepare_extra_step_kwargs(generator, eta)
 
-        self.attention_store = AttentionStore(attn_res=attn_res)
+        if attn_res is None:
+            attn_res = int(np.ceil(width / 32)), int(np.ceil(height / 32))
+        self.attention_store = AttentionStore(attn_res)
         self.register_attention_control()
 
         # default config for step size from original repo