data_source

Summary:
Move dataset_args and dataloader_args from ExperimentConfig into a new member called datasource so that it can contain replaceables.

Also add enum Task for task type.

Reviewed By: shapovalov

Differential Revision: D36201719

fbshipit-source-id: 47d6967bfea3b7b146b6bbd1572e0457c9365871

projects/implicitron_trainer/configs/repro_singleseq_wce_base.yaml

@@ -1,18 +1,19 @@
 defaults:
 - repro_singleseq_base
 - _self_
-dataloader_args:
-  batch_size: 10
-  dataset_len: 1000
-  dataset_len_val: 1
-  num_workers: 8
-  images_per_seq_options:
-  - 2
-  - 3
-  - 4
-  - 5
-  - 6
-  - 7
-  - 8
-  - 9
-  - 10
+data_source_args:
+  dataloader_args:
+    batch_size: 10
+    dataset_len: 1000
+    dataset_len_val: 1
+    num_workers: 8
+    images_per_seq_options:
+    - 2
+    - 3
+    - 4
+    - 5
+    - 6
+    - 7
+    - 8
+    - 9
+    - 10