Call transforms directly

[richardrl]

Is there any way to call transforms directly?

(Pdb) PIPELINES['img'][0]
<ffcv.fields.rgb_image.SimpleRGBImageDecoder object at 0x7f60b19c10a0>
(Pdb) PIPELINES['img']0
*** TypeError: 'SimpleRGBImageDecoder' object is not callable

This doesn't work.

This is important when we want to reproduce the pipeline outside of FFCV.