[bug] Fix float/int guidance scale not working in `StableVideoDiffusionPipeline` (#7143)

* [bug] Fix float/int guidance scale not working in `StableVideoDiffusionPipeline`

* Add test to disable CFG on SVD

---------
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

src/diffusers/pipelines/stable_video_diffusion/pipeline_stable_video_diffusion.py

@@ -322,7 +322,7 @@ class StableVideoDiffusionPipeline(DiffusionPipeline):
     @property
     def do_classifier_free_guidance(self):
         if isinstance(self.guidance_scale, (int, float)):
-            return self.guidance_scale
+            return self.guidance_scale > 1
         return self.guidance_scale.max() > 1
 
     @property

tests/pipelines/stable_video_diffusion/test_stable_video_diffusion.py

@@ -496,6 +496,22 @@ class StableVideoDiffusionPipelineFastTests(PipelineTesterMixin, unittest.TestCa
         max_diff = np.abs(to_np(output_with_offload) - to_np(output_without_offload)).max()
         self.assertLess(max_diff, expected_max_diff, "XFormers attention should not affect the inference results")
 
+    def test_disable_cfg(self):
+        components = self.get_dummy_components()
+        pipe = self.pipeline_class(**components)
+        for component in pipe.components.values():
+            if hasattr(component, "set_default_attn_processor"):
+                component.set_default_attn_processor()
+
+        pipe.to(torch_device)
+        pipe.set_progress_bar_config(disable=None)
+
+        generator_device = "cpu"
+        inputs = self.get_dummy_inputs(generator_device)
+        inputs["max_guidance_scale"] = 1.0
+        output = pipe(**inputs).frames
+        self.assertEqual(len(output.shape), 5)
+
 
 @slow
 @require_torch_gpu