Revert "Minimize re-exports from __init__ files (#44)"

This reverts commit 57862fb.

sgm/__init__.py

@@ -1 +1,5 @@
+from .data import StableDataModuleFromConfig
+from .models import AutoencodingEngine, DiffusionEngine
+from .util import instantiate_from_config, get_configs_path
+
 __version__ = "0.0.1"

sgm/data/__init__.py

@@ -0,0 +1 @@
+from .dataset import StableDataModuleFromConfig

sgm/models/__init__.py

@@ -0,0 +1,2 @@
+from .autoencoder import AutoencodingEngine
+from .diffusion import DiffusionEngine

sgm/modules/__init__.py

@@ -1,12 +1,5 @@
 from .encoders.modules import GeneralConditioner
 
-__all__ = [
-    # `sgm.models.GeneralConditioner` is referenced in model configurations, etc.,
-    # so it must be re-exported from this module.
-    "GeneralConditioner",
-    "UNCONDITIONAL_CONFIG",
-]
-
 UNCONDITIONAL_CONFIG = {
     "target": "sgm.modules.GeneralConditioner",
     "params": {"emb_models": []},

sgm/modules/diffusionmodules/__init__.py

@@ -0,0 +1,7 @@
+from .denoiser import Denoiser
+from .discretizer import Discretization
+from .loss import StandardDiffusionLoss
+from .model import Model, Encoder, Decoder
+from .openaimodel import UNetModel
+from .sampling import BaseDiffusionSampler
+from .wrappers import OpenAIWrapper