Add a dataloader for training the decoder (#57)

* Added dataloader and updated requirements

* Added option to set embedding shard width separately from webdataset shard length.
There must be a better way to do this.

* Changed embedding loader to read using fsspec

* Moved the loader into a more compatible location

* Removed unnecessary package

* Fixed typo (Embeding -> Embedding)

* Simplified example embedding finder code to remove unnecessary get_file_list function

* Added example usage of ImageEmbeddingDataset

* Changed the name of create_dataloader to be more verbose
Added a dataloaders __init__.py

setup.py

@@ -34,9 +34,10 @@ setup(
     'torchvision',
     'tqdm',
     'vector-quantize-pytorch',
-    'webdataset',
-    'x-clip>=0.5.1',
-    'youtokentome'
+    'x-clip>=0.4.4',
+    'youtokentome',
+    'webdataset>=0.2.5',
+    'fsspec>=2022.1.0'
   ],
   classifiers=[
     'Development Status :: 4 - Beta',