diff --git a/montblanc/impl/rime/tensorflow/sources/__init__.py b/montblanc/impl/rime/tensorflow/sources/__init__.py
index <HASH>..<HASH> 100644
--- a/montblanc/impl/rime/tensorflow/sources/__init__.py
+++ b/montblanc/impl/rime/tensorflow/sources/__init__.py
@@ -21,9 +21,9 @@
 from montblanc.impl.rime.tensorflow.sources.source_context import (
     SourceContext)
 from montblanc.impl.rime.tensorflow.sources.source_provider import (
-    SourceProvider, find_sources)
+    SourceProvider, find_sources, DEFAULT_ARGSPEC)
 from montblanc.impl.rime.tensorflow.sources.defaults_source_provider import (
-    DefaultsSourceProvider)
+    DefaultsSourceProvider, constant_cache, chunk_cache)
 from montblanc.impl.rime.tensorflow.sources.ms_source_provider import (
     MSSourceProvider)
 from montblanc.impl.rime.tensorflow.sources.np_source_provider import (
import more into ...tensorflow.sources module

Imports from submodules in this modules were getting far too long. e.g.

```python
from montblanc.impl.rime.tensorflow.sources.defaults_source_provider
import constant_cache
```

is now

```python
from montblanc.impl.rime.tensorflow.sources import constant_cache
```