diff --git a/README.md b/README.md
index f6889baf..32dc7c82 100644
--- a/README.md
+++ b/README.md
@@ -249,24 +249,24 @@ image_pil = PIL.Image.fromarray(image_processed[0])
 image_pil.save("test.png")
 ```
 
-#### **Text to speech with GradTTS and BDDM**
+#### **Text to speech with GradTTS and BDDMPipeline**
 
 ```python
 import torch
-from diffusers import BDDM, GradTTS
+from diffusers import BDDMPipeline, GradTTS
 
 torch_device = "cuda"
 
 # load grad tts and bddm pipelines
 grad_tts = GradTTS.from_pretrained("fusing/grad-tts-libri-tts")
-bddm = BDDM.from_pretrained("fusing/diffwave-vocoder-ljspeech")
+bddm = BDDMPipeline.from_pretrained("fusing/diffwave-vocoder-ljspeech")
 
 text = "Hello world, I missed you so much."
 
 # generate mel spectograms using text
 mel_spec = grad_tts(text, torch_device=torch_device)
 
-#  generate the speech by passing mel spectograms to BDDM pipeline
+#  generate the speech by passing mel spectograms to BDDMPipeline pipeline
 generator = torch.manual_seed(42)
 audio = bddm(mel_spec, generator, torch_device=torch_device)
 
diff --git a/src/diffusers/__init__.py b/src/diffusers/__init__.py
index efb89e85..aaca3d34 100644
--- a/src/diffusers/__init__.py
+++ b/src/diffusers/__init__.py
@@ -11,19 +11,19 @@ from .models.unet import UNetModel
 from .models.unet_ldm import UNetLDMModel
 from .models.unet_rl import TemporalUNet
 from .pipeline_utils import DiffusionPipeline
-from .pipelines import BDDM, DDIM, DDPM, PNDM
+from .pipelines import BDDMPipeline, DDIMPipeline, DDPMPipeline, PNDMPipeline
 from .schedulers import DDIMScheduler, DDPMScheduler, GradTTSScheduler, PNDMScheduler, SchedulerMixin
 
 
 if is_transformers_available():
     from .models.unet_glide import GlideSuperResUNetModel, GlideTextToImageUNetModel, GlideUNetModel
     from .models.unet_grad_tts import UNetGradTTSModel
-    from .pipelines import Glide, LatentDiffusion
+    from .pipelines import GlidePipeline, LatentDiffusionPipeline
 else:
     from .utils.dummy_transformers_objects import *
 
 
 if is_transformers_available() and is_inflect_available() and is_unidecode_available():
-    from .pipelines import GradTTS
+    from .pipelines import GradTTSPipeline
 else:
     from .utils.dummy_transformers_and_inflect_and_unidecode_objects import *
diff --git a/src/diffusers/pipeline_utils.py b/src/diffusers/pipeline_utils.py
index d8a2644d..339ebb07 100644
--- a/src/diffusers/pipeline_utils.py
+++ b/src/diffusers/pipeline_utils.py
@@ -21,7 +21,6 @@ from typing import Optional, Union
 from huggingface_hub import snapshot_download
 
 from .configuration_utils import ConfigMixin
-from .dynamic_modules_utils import get_class_from_dynamic_module
 from .utils import DIFFUSERS_CACHE, logging
 
 
@@ -81,9 +80,6 @@ class DiffusionPipeline(ConfigMixin):
             # set models
             setattr(self, name, module)
 
-        register_dict = {"_module": self.__module__.split(".")[-1]}
-        self.register_to_config(**register_dict)
-
     def save_pretrained(self, save_directory: Union[str, os.PathLike]):
         self.save_config(save_directory)
 
@@ -139,11 +135,7 @@ class DiffusionPipeline(ConfigMixin):
 
         config_dict = cls.get_config_dict(cached_folder)
 
-        # 2. Get class name and module candidates to load custom models
-        module_candidate_name = config_dict["_module"]
-        module_candidate = module_candidate_name + ".py"
-
-        # 3. Load the pipeline class, if using custom module then load it from the hub
+        # 2. Load the pipeline class, if using custom module then load it from the hub
         # if we load from explicit class, let's use it
         if cls != DiffusionPipeline:
             pipeline_class = cls
@@ -151,11 +143,6 @@ class DiffusionPipeline(ConfigMixin):
             diffusers_module = importlib.import_module(cls.__module__.split(".")[0])
             pipeline_class = getattr(diffusers_module, config_dict["_class_name"])
 
-            # (TODO - we should allow to load custom pipelines
-            # else we need to load the correct module from the Hub
-            # module = module_candidate
-            # pipeline_class = get_class_from_dynamic_module(cached_folder, module, class_name_, cached_folder)
-
         init_dict, _ = pipeline_class.extract_init_dict(config_dict, **kwargs)
 
         init_kwargs = {}
@@ -163,7 +150,7 @@ class DiffusionPipeline(ConfigMixin):
         # import it here to avoid circular import
         from diffusers import pipelines
 
-        # 4. Load each module in the pipeline
+        # 3. Load each module in the pipeline
         for name, (library_name, class_name) in init_dict.items():
             is_pipeline_module = hasattr(pipelines, library_name)
             # if the model is in a pipeline module, then we load it from the pipeline
@@ -171,14 +158,7 @@ class DiffusionPipeline(ConfigMixin):
                 pipeline_module = getattr(pipelines, library_name)
                 class_obj = getattr(pipeline_module, class_name)
                 importable_classes = ALL_IMPORTABLE_CLASSES
-                class_candidates = {c: class_obj for c in ALL_IMPORTABLE_CLASSES.keys()}
-            elif library_name == module_candidate_name:
-                # if the model is not in diffusers or transformers, we need to load it from the hub
-                # assumes that it's a subclass of ModelMixin
-                class_obj = get_class_from_dynamic_module(cached_folder, module_candidate, class_name, cached_folder)
-                # since it's not from a library, we need to check class candidates for all importable classes
-                importable_classes = ALL_IMPORTABLE_CLASSES
-                class_candidates = {c: class_obj for c in ALL_IMPORTABLE_CLASSES.keys()}
+                class_candidates = {c: class_obj for c in importable_classes.keys()}
             else:
                 # else we just import it from the library.
                 library = importlib.import_module(library_name)
diff --git a/src/diffusers/pipelines/README.md b/src/diffusers/pipelines/README.md
index 61e653a8..c0558d35 100644
--- a/src/diffusers/pipelines/README.md
+++ b/src/diffusers/pipelines/README.md
@@ -15,5 +15,5 @@ TODO(Patrick, Anton, Suraj)
 - PNDM for unconditional image generation in [pipeline_pndm](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/pipeline_pndm.py).
 - Latent diffusion for text to image generation / conditional image generation in [pipeline_latent_diffusion](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/pipeline_latent_diffusion.py).
 - Glide for text to image generation / conditional image generation in [pipeline_glide](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/pipeline_glide.py).
-- BDDM for spectrogram-to-sound vocoding in [pipeline_bddm](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/pipeline_bddm.py).
+- BDDMPipeline for spectrogram-to-sound vocoding in [pipeline_bddm](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/pipeline_bddm.py).
 - Grad-TTS for text to audio generation / conditional audio generation in [pipeline_grad_tts](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/pipeline_grad_tts.py).
diff --git a/src/diffusers/pipelines/__init__.py b/src/diffusers/pipelines/__init__.py
index 7ba126b0..d26c5fc8 100644
--- a/src/diffusers/pipelines/__init__.py
+++ b/src/diffusers/pipelines/__init__.py
@@ -1,14 +1,14 @@
 from ..utils import is_inflect_available, is_transformers_available, is_unidecode_available
-from .pipeline_bddm import BDDM
-from .pipeline_ddim import DDIM
-from .pipeline_ddpm import DDPM
-from .pipeline_pndm import PNDM
+from .pipeline_bddm import BDDMPipeline
+from .pipeline_ddim import DDIMPipeline
+from .pipeline_ddpm import DDPMPipeline
+from .pipeline_pndm import PNDMPipeline
 
 
 if is_transformers_available():
-    from .pipeline_glide import Glide
-    from .pipeline_latent_diffusion import LatentDiffusion
+    from .pipeline_glide import GlidePipeline
+    from .pipeline_latent_diffusion import LatentDiffusionPipeline
 
 
 if is_transformers_available() and is_unidecode_available() and is_inflect_available():
-    from .pipeline_grad_tts import GradTTS
+    from .pipeline_grad_tts import GradTTSPipeline
diff --git a/src/diffusers/pipelines/pipeline_bddm.py b/src/diffusers/pipelines/pipeline_bddm.py
index 3ca79c3d..8b24cb9c 100644
--- a/src/diffusers/pipelines/pipeline_bddm.py
+++ b/src/diffusers/pipelines/pipeline_bddm.py
@@ -271,7 +271,7 @@ class DiffWave(ModelMixin, ConfigMixin):
         return self.final_conv(x)
 
 
-class BDDM(DiffusionPipeline):
+class BDDMPipeline(DiffusionPipeline):
     def __init__(self, diffwave, noise_scheduler):
         super().__init__()
         noise_scheduler = noise_scheduler.set_format("pt")
diff --git a/src/diffusers/pipelines/pipeline_ddim.py b/src/diffusers/pipelines/pipeline_ddim.py
index 272d3edb..8da24dbf 100644
--- a/src/diffusers/pipelines/pipeline_ddim.py
+++ b/src/diffusers/pipelines/pipeline_ddim.py
@@ -21,7 +21,7 @@ import tqdm
 from ..pipeline_utils import DiffusionPipeline
 
 
-class DDIM(DiffusionPipeline):
+class DDIMPipeline(DiffusionPipeline):
     def __init__(self, unet, noise_scheduler):
         super().__init__()
         noise_scheduler = noise_scheduler.set_format("pt")
diff --git a/src/diffusers/pipelines/pipeline_ddpm.py b/src/diffusers/pipelines/pipeline_ddpm.py
index ebcce773..9cf83bfb 100644
--- a/src/diffusers/pipelines/pipeline_ddpm.py
+++ b/src/diffusers/pipelines/pipeline_ddpm.py
@@ -21,7 +21,7 @@ import tqdm
 from ..pipeline_utils import DiffusionPipeline
 
 
-class DDPM(DiffusionPipeline):
+class DDPMPipeline(DiffusionPipeline):
     def __init__(self, unet, noise_scheduler):
         super().__init__()
         noise_scheduler = noise_scheduler.set_format("pt")
diff --git a/src/diffusers/pipelines/pipeline_glide.py b/src/diffusers/pipelines/pipeline_glide.py
index 00460553..8680b754 100644
--- a/src/diffusers/pipelines/pipeline_glide.py
+++ b/src/diffusers/pipelines/pipeline_glide.py
@@ -711,7 +711,7 @@ def _extract_into_tensor(arr, timesteps, broadcast_shape):
     return res + torch.zeros(broadcast_shape, device=timesteps.device)
 
 
-class Glide(DiffusionPipeline):
+class GlidePipeline(DiffusionPipeline):
     def __init__(
         self,
         text_unet: GlideTextToImageUNetModel,
diff --git a/src/diffusers/pipelines/pipeline_grad_tts.py b/src/diffusers/pipelines/pipeline_grad_tts.py
index 42011249..51c861a2 100644
--- a/src/diffusers/pipelines/pipeline_grad_tts.py
+++ b/src/diffusers/pipelines/pipeline_grad_tts.py
@@ -420,7 +420,7 @@ class TextEncoder(ModelMixin, ConfigMixin):
         return mu, logw, x_mask
 
 
-class GradTTS(DiffusionPipeline):
+class GradTTSPipeline(DiffusionPipeline):
     def __init__(self, unet, text_encoder, noise_scheduler, tokenizer):
         super().__init__()
         noise_scheduler = noise_scheduler.set_format("pt")
@@ -430,7 +430,14 @@ class GradTTS(DiffusionPipeline):
 
     @torch.no_grad()
     def __call__(
-        self, text, num_inference_steps=50, temperature=1.3, length_scale=0.91, speaker_id=15, torch_device=None
+        self,
+        text,
+        num_inference_steps=50,
+        temperature=1.3,
+        length_scale=0.91,
+        speaker_id=15,
+        torch_device=None,
+        generator=None,
     ):
         if torch_device is None:
             torch_device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
@@ -464,7 +471,7 @@ class GradTTS(DiffusionPipeline):
         mu_y = mu_y.transpose(1, 2)
 
         # Sample latent representation from terminal distribution N(mu_y, I)
-        z = mu_y + torch.randn_like(mu_y, device=mu_y.device) / temperature
+        z = mu_y + torch.randn(mu_y.shape, device=mu_y.device, generator=generator) / temperature
 
         xt = z * y_mask
         h = 1.0 / num_inference_steps
diff --git a/src/diffusers/pipelines/pipeline_latent_diffusion.py b/src/diffusers/pipelines/pipeline_latent_diffusion.py
index cd7f653b..7d386765 100644
--- a/src/diffusers/pipelines/pipeline_latent_diffusion.py
+++ b/src/diffusers/pipelines/pipeline_latent_diffusion.py
@@ -860,7 +860,7 @@ class AutoencoderKL(ModelMixin, ConfigMixin):
         return dec, posterior
 
 
-class LatentDiffusion(DiffusionPipeline):
+class LatentDiffusionPipeline(DiffusionPipeline):
     def __init__(self, vqvae, bert, tokenizer, unet, noise_scheduler):
         super().__init__()
         noise_scheduler = noise_scheduler.set_format("pt")
diff --git a/src/diffusers/pipelines/pipeline_pndm.py b/src/diffusers/pipelines/pipeline_pndm.py
index a19f933e..5fd8a984 100644
--- a/src/diffusers/pipelines/pipeline_pndm.py
+++ b/src/diffusers/pipelines/pipeline_pndm.py
@@ -21,7 +21,7 @@ import tqdm
 from ..pipeline_utils import DiffusionPipeline
 
 
-class PNDM(DiffusionPipeline):
+class PNDMPipeline(DiffusionPipeline):
     def __init__(self, unet, noise_scheduler):
         super().__init__()
         noise_scheduler = noise_scheduler.set_format("pt")
diff --git a/tests/test_modeling_utils.py b/tests/test_modeling_utils.py
index 372435de..720e6874 100755
--- a/tests/test_modeling_utils.py
+++ b/tests/test_modeling_utils.py
@@ -22,17 +22,17 @@ import numpy as np
 import torch
 
 from diffusers import (
-    BDDM,
-    DDIM,
-    DDPM,
-    Glide,
-    PNDM,
+    BDDMPipeline,
+    DDIMPipeline,
     DDIMScheduler,
+    DDPMPipeline,
     DDPMScheduler,
+    GlidePipeline,
     GlideSuperResUNetModel,
     GlideTextToImageUNetModel,
-    GradTTS,
-    LatentDiffusion,
+    GradTTSPipeline,
+    LatentDiffusionPipeline,
+    PNDMPipeline,
     PNDMScheduler,
     UNetGradTTSModel,
     UNetLDMModel,
@@ -583,11 +583,11 @@ class PipelineTesterMixin(unittest.TestCase):
         model = UNetModel(ch=32, ch_mult=(1, 2), num_res_blocks=2, attn_resolutions=(16,), resolution=32)
         schedular = DDPMScheduler(timesteps=10)
 
-        ddpm = DDPM(model, schedular)
+        ddpm = DDPMPipeline(model, schedular)
 
         with tempfile.TemporaryDirectory() as tmpdirname:
             ddpm.save_pretrained(tmpdirname)
-            new_ddpm = DDPM.from_pretrained(tmpdirname)
+            new_ddpm = DDPMPipeline.from_pretrained(tmpdirname)
 
         generator = torch.manual_seed(0)
 
@@ -601,7 +601,7 @@ class PipelineTesterMixin(unittest.TestCase):
     def test_from_pretrained_hub(self):
         model_path = "fusing/ddpm-cifar10"
 
-        ddpm = DDPM.from_pretrained(model_path)
+        ddpm = DDPMPipeline.from_pretrained(model_path)
         ddpm_from_hub = DiffusionPipeline.from_pretrained(model_path)
 
         ddpm.noise_scheduler.num_timesteps = 10
@@ -624,7 +624,7 @@ class PipelineTesterMixin(unittest.TestCase):
         noise_scheduler = DDPMScheduler.from_config(model_id)
         noise_scheduler = noise_scheduler.set_format("pt")
 
-        ddpm = DDPM(unet=unet, noise_scheduler=noise_scheduler)
+        ddpm = DDPMPipeline(unet=unet, noise_scheduler=noise_scheduler)
         image = ddpm(generator=generator)
 
         image_slice = image[0, -1, -3:, -3:].cpu()
@@ -641,7 +641,7 @@ class PipelineTesterMixin(unittest.TestCase):
         unet = UNetModel.from_pretrained(model_id)
         noise_scheduler = DDIMScheduler(tensor_format="pt")
 
-        ddim = DDIM(unet=unet, noise_scheduler=noise_scheduler)
+        ddim = DDIMPipeline(unet=unet, noise_scheduler=noise_scheduler)
         image = ddim(generator=generator, eta=0.0)
 
         image_slice = image[0, -1, -3:, -3:].cpu()
@@ -660,7 +660,7 @@ class PipelineTesterMixin(unittest.TestCase):
         unet = UNetModel.from_pretrained(model_id)
         noise_scheduler = PNDMScheduler(tensor_format="pt")
 
-        pndm = PNDM(unet=unet, noise_scheduler=noise_scheduler)
+        pndm = PNDMPipeline(unet=unet, noise_scheduler=noise_scheduler)
         image = pndm(generator=generator)
 
         image_slice = image[0, -1, -3:, -3:].cpu()
@@ -674,7 +674,7 @@ class PipelineTesterMixin(unittest.TestCase):
     @slow
     def test_ldm_text2img(self):
         model_id = "fusing/latent-diffusion-text2im-large"
-        ldm = LatentDiffusion.from_pretrained(model_id)
+        ldm = LatentDiffusionPipeline.from_pretrained(model_id)
 
         prompt = "A painting of a squirrel eating a burger"
         generator = torch.manual_seed(0)
@@ -689,7 +689,7 @@ class PipelineTesterMixin(unittest.TestCase):
     @slow
     def test_glide_text2img(self):
         model_id = "fusing/glide-base"
-        glide = Glide.from_pretrained(model_id)
+        glide = GlidePipeline.from_pretrained(model_id)
 
         prompt = "a pencil sketch of a corgi"
         generator = torch.manual_seed(0)
@@ -704,22 +704,25 @@ class PipelineTesterMixin(unittest.TestCase):
     @slow
     def test_grad_tts(self):
         model_id = "fusing/grad-tts-libri-tts"
-        grad_tts = GradTTS.from_pretrained(model_id)
+        grad_tts = GradTTSPipeline.from_pretrained(model_id)
 
         text = "Hello world, I missed you so much."
+        generator = torch.manual_seed(0)
 
         # generate mel spectograms using text
-        mel_spec = grad_tts(text)
+        mel_spec = grad_tts(text, generator=generator)
 
-        assert mel_spec.shape == (1, 256, 256, 3)
-        expected_slice = torch.tensor([0.7119, 0.7073, 0.6460, 0.7780, 0.7423, 0.6926, 0.7378, 0.7189, 0.7784])
-        assert (mel_spec.flatten() - expected_slice).abs().max() < 1e-2
+        assert mel_spec.shape == (1, 80, 143)
+        expected_slice = torch.tensor(
+            [-6.6119, -6.5963, -6.2776, -6.7496, -6.7096, -6.5131, -6.4643, -6.4817, -6.7185]
+        )
+        assert (mel_spec[0, :3, :3].flatten() - expected_slice).abs().max() < 1e-2
 
     def test_module_from_pipeline(self):
         model = DiffWave(num_res_layers=4)
         noise_scheduler = DDPMScheduler(timesteps=12)
 
-        bddm = BDDM(model, noise_scheduler)
+        bddm = BDDMPipeline(model, noise_scheduler)
 
         # check if the library name for the diffwave moduel is set to pipeline module
         self.assertTrue(bddm.config["diffwave"][0] == "pipeline_bddm")
@@ -727,6 +730,6 @@ class PipelineTesterMixin(unittest.TestCase):
         # check if we can save and load the pipeline
         with tempfile.TemporaryDirectory() as tmpdirname:
             bddm.save_pretrained(tmpdirname)
-            _ = BDDM.from_pretrained(tmpdirname)
+            _ = BDDMPipeline.from_pretrained(tmpdirname)
             # check if the same works using the DifusionPipeline class
             _ = DiffusionPipeline.from_pretrained(tmpdirname)