[Flax] Complete tests (#828)

tests/test_pipelines_flax.py

@@ -24,7 +24,7 @@ from diffusers.utils.testing_utils import require_flax, slow
 if is_flax_available():
     import jax
     import jax.numpy as jnp
-    from diffusers import FlaxStableDiffusionPipeline
+    from diffusers import FlaxDDIMScheduler, FlaxStableDiffusionPipeline
     from flax.jax_utils import replicate
     from flax.training.common_utils import shard
     from jax import pmap
@@ -61,7 +61,7 @@ class FlaxPipelineTests(unittest.TestCase):
 
         assert images.shape == (8, 1, 64, 64, 3)
         assert np.abs((np.abs(images[0, 0, :2, :2, -2:], dtype=np.float32).sum() - 4.151474)) < 1e-3
-        assert np.abs((np.abs(images, dtype=np.float32).sum() - 49947.875)) < 1e-2
+        assert np.abs((np.abs(images, dtype=np.float32).sum() - 49947.875)) < 5e-1
 
         images_pil = pipeline.numpy_to_pil(np.asarray(images.reshape((num_samples,) + images.shape[-3:])))
 
@@ -93,13 +93,9 @@ class FlaxPipelineTests(unittest.TestCase):
 
         images = p_sample(prompt_ids, params, prng_seed, num_inference_steps).images
 
-        images_pil = pipeline.numpy_to_pil(np.asarray(images.reshape((num_samples,) + images.shape[-3:])))
-        for i, image in enumerate(images_pil):
-            image.save(f"/home/patrick/images/flax-test-{i}_fp32.png")
-
         assert images.shape == (8, 1, 512, 512, 3)
         assert np.abs((np.abs(images[0, 0, :2, :2, -2:], dtype=np.float32).sum() - 0.05652401)) < 1e-3
-        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2383808.2)) < 1e-2
+        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2383808.2)) < 5e-1
 
     def test_stable_diffusion_v1_4_bfloat_16(self):
         pipeline, params = FlaxStableDiffusionPipeline.from_pretrained(
@@ -129,7 +125,7 @@ class FlaxPipelineTests(unittest.TestCase):
 
         assert images.shape == (8, 1, 512, 512, 3)
         assert np.abs((np.abs(images[0, 0, :2, :2, -2:], dtype=np.float32).sum() - 0.06652832)) < 1e-3
-        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2384849.8)) < 1e-2
+        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2384849.8)) < 5e-1
 
     def test_stable_diffusion_v1_4_bfloat_16_with_safety(self):
         pipeline, params = FlaxStableDiffusionPipeline.from_pretrained(
@@ -157,4 +153,49 @@ class FlaxPipelineTests(unittest.TestCase):
 
         assert images.shape == (8, 1, 512, 512, 3)
         assert np.abs((np.abs(images[0, 0, :2, :2, -2:], dtype=np.float32).sum() - 0.06652832)) < 1e-3
-        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2384849.8)) < 1e-2
+        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2384849.8)) < 5e-1
+
+    def test_stable_diffusion_v1_4_bfloat_16_ddim(self):
+        scheduler = FlaxDDIMScheduler(
+            beta_start=0.00085,
+            beta_end=0.012,
+            beta_schedule="scaled_linear",
+            set_alpha_to_one=False,
+            steps_offset=1,
+        )
+
+        pipeline, params = FlaxStableDiffusionPipeline.from_pretrained(
+            "CompVis/stable-diffusion-v1-4",
+            revision="bf16",
+            dtype=jnp.bfloat16,
+            scheduler=scheduler,
+            safety_checker=None,
+        )
+        scheduler_state = scheduler.create_state()
+
+        params["scheduler"] = scheduler_state
+
+        prompt = (
+            "A cinematic film still of Morgan Freeman starring as Jimi Hendrix, portrait, 40mm lens, shallow depth of"
+            " field, close up, split lighting, cinematic"
+        )
+
+        prng_seed = jax.random.PRNGKey(0)
+        num_inference_steps = 50
+
+        num_samples = jax.device_count()
+        prompt = num_samples * [prompt]
+        prompt_ids = pipeline.prepare_inputs(prompt)
+
+        p_sample = pmap(pipeline.__call__, static_broadcasted_argnums=(3,))
+
+        # shard inputs and rng
+        params = replicate(params)
+        prng_seed = jax.random.split(prng_seed, 8)
+        prompt_ids = shard(prompt_ids)
+
+        images = p_sample(prompt_ids, params, prng_seed, num_inference_steps).images
+
+        assert images.shape == (8, 1, 512, 512, 3)
+        assert np.abs((np.abs(images[0, 0, :2, :2, -2:], dtype=np.float32).sum() - 0.045043945)) < 1e-3
+        assert np.abs((np.abs(images, dtype=np.float32).sum() - 2347693.5)) < 5e-1