[Accelerate model loading] Fix meta device and super low memory usage (#1016)

* [Accelerate model loading] Fix meta device and super low memory usage

* better naming

src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py

@@ -119,14 +119,13 @@ class StableDiffusionPipeline(DiffusionPipeline):
         # set slice_size = `None` to disable `attention slicing`
         self.enable_attention_slicing(None)
 
-    def cuda_with_minimal_gpu_usage(self):
+    def enable_sequential_cpu_offload(self):
         if is_accelerate_available():
             from accelerate import cpu_offload
         else:
             raise ImportError("Please install accelerate via `pip install accelerate`")
 
         device = torch.device("cuda")
-        self.enable_attention_slicing(1)
 
         for cpu_offloaded_model in [self.unet, self.text_encoder, self.vae, self.safety_checker]:
             cpu_offload(cpu_offloaded_model, device)

tests/pipelines/stable_diffusion/test_stable_diffusion.py

@@ -15,6 +15,7 @@
 
 import gc
 import random
+import time
 import unittest
 
 import numpy as np
@@ -730,3 +731,39 @@ class StableDiffusionPipelineIntegrationTests(unittest.TestCase):
             )
         assert test_callback_fn.has_been_called
         assert number_of_steps == 51
+
+    def test_stable_diffusion_accelerate_auto_device(self):
+        pipeline_id = "CompVis/stable-diffusion-v1-4"
+
+        start_time = time.time()
+        pipeline_normal_load = StableDiffusionPipeline.from_pretrained(
+            pipeline_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True
+        )
+        pipeline_normal_load.to(torch_device)
+        normal_load_time = time.time() - start_time
+
+        start_time = time.time()
+        _ = StableDiffusionPipeline.from_pretrained(
+            pipeline_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True, device_map="auto"
+        )
+        meta_device_load_time = time.time() - start_time
+
+        assert 2 * meta_device_load_time < normal_load_time
+
+    @unittest.skipIf(torch_device == "cpu", "This test is supposed to run on GPU")
+    def test_stable_diffusion_pipeline_with_unet_on_gpu_only(self):
+        torch.cuda.empty_cache()
+        torch.cuda.reset_max_memory_allocated()
+
+        pipeline_id = "CompVis/stable-diffusion-v1-4"
+        prompt = "Andromeda galaxy in a bottle"
+
+        pipeline = StableDiffusionPipeline.from_pretrained(pipeline_id, revision="fp16", torch_dtype=torch.float16)
+        pipeline.enable_attention_slicing(1)
+        pipeline.enable_sequential_cpu_offload()
+
+        _ = pipeline(prompt, num_inference_steps=5)
+
+        mem_bytes = torch.cuda.max_memory_allocated()
+        # make sure that less than 1.5 GB is allocated
+        assert mem_bytes < 1.5 * 10**9

tests/test_pipelines.py

@@ -17,15 +17,12 @@ import gc
 import os
 import random
 import tempfile
-import tracemalloc
 import unittest
 
 import numpy as np
 import torch
 
-import accelerate
 import PIL
-import transformers
 from diffusers import (
     AutoencoderKL,
     DDIMPipeline,
@@ -44,8 +41,7 @@ from diffusers import (
 from diffusers.pipeline_utils import DiffusionPipeline
 from diffusers.schedulers.scheduling_utils import SCHEDULER_CONFIG_NAME
 from diffusers.utils import CONFIG_NAME, WEIGHTS_NAME, floats_tensor, slow, torch_device
-from diffusers.utils.testing_utils import CaptureLogger, get_tests_dir, require_torch_gpu
-from packaging import version
+from diffusers.utils.testing_utils import CaptureLogger, get_tests_dir
 from PIL import Image
 from transformers import CLIPFeatureExtractor, CLIPModel, CLIPTextConfig, CLIPTextModel, CLIPTokenizer
 
@@ -487,71 +483,3 @@ class PipelineSlowTests(unittest.TestCase):
 
         # the values aren't exactly equal, but the images look the same visually
         assert np.abs(ddpm_images - ddim_images).max() < 1e-1
-
-    @require_torch_gpu
-    def test_stable_diffusion_accelerate_load_works(self):
-        if version.parse(version.parse(transformers.__version__).base_version) < version.parse("4.23"):
-            return
-
-        if version.parse(version.parse(accelerate.__version__).base_version) < version.parse("0.14"):
-            return
-
-        model_id = "CompVis/stable-diffusion-v1-4"
-        _ = StableDiffusionPipeline.from_pretrained(
-            model_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True, device_map="auto"
-        ).to(torch_device)
-
-    @require_torch_gpu
-    def test_stable_diffusion_accelerate_load_reduces_memory_footprint(self):
-        if version.parse(version.parse(transformers.__version__).base_version) < version.parse("4.23"):
-            return
-
-        if version.parse(version.parse(accelerate.__version__).base_version) < version.parse("0.14"):
-            return
-
-        pipeline_id = "CompVis/stable-diffusion-v1-4"
-
-        torch.cuda.empty_cache()
-        gc.collect()
-
-        tracemalloc.start()
-        pipeline_normal_load = StableDiffusionPipeline.from_pretrained(
-            pipeline_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True
-        )
-        pipeline_normal_load.to(torch_device)
-        _, peak_normal = tracemalloc.get_traced_memory()
-        tracemalloc.stop()
-
-        del pipeline_normal_load
-        torch.cuda.empty_cache()
-        gc.collect()
-
-        tracemalloc.start()
-        _ = StableDiffusionPipeline.from_pretrained(
-            pipeline_id, revision="fp16", torch_dtype=torch.float16, use_auth_token=True, device_map="auto"
-        )
-        _, peak_accelerate = tracemalloc.get_traced_memory()
-
-        tracemalloc.stop()
-
-        assert peak_accelerate < peak_normal
-
-    @slow
-    @unittest.skipIf(torch_device == "cpu", "This test is supposed to run on GPU")
-    def test_stable_diffusion_pipeline_with_unet_on_gpu_only(self):
-        torch.cuda.empty_cache()
-        torch.cuda.reset_max_memory_allocated()
-
-        pipeline_id = "CompVis/stable-diffusion-v1-4"
-        prompt = "Andromeda galaxy in a bottle"
-
-        pipeline = StableDiffusionPipeline.from_pretrained(
-            pipeline_id, revision="fp16", torch_dtype=torch.float32, use_auth_token=True
-        )
-        pipeline.cuda_with_minimal_gpu_usage()
-
-        _ = pipeline(prompt)
-
-        mem_bytes = torch.cuda.max_memory_allocated()
-        # make sure that less than 0.8 GB is allocated
-        assert mem_bytes < 0.8 * 10**9