Eager Torch

[SergeyTsimfer]

This PR proposes to add EagerTorch model that:

• can build off of batch_data during first call of the train method

• allows for better usage of native torch modules

• does not use redundant tf-like methods (make_inputs, has_classes, etc)

[review-notebook-app]

Check out this pull request on 

You'll be able to see Jupyter notebook diff and discuss changes. Powered by ReviewNB.

[SergeyTsimfer]

@analysiscenter/batchflow currently, main subject of the review should be EagerTorch class itself

Current TODO:
Rewrite all the layers from TorchModel
Add features like microbatch, async training, multi-device, etc

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@79ead40). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master     #438   +/-   ##
=========================================
  Coverage          ?   35.92%           
=========================================
  Files             ?      149           
  Lines             ?    14459           
  Branches          ?        0           
=========================================
  Hits              ?     5195           
  Misses            ?     9264           
  Partials          ?        0

Impacted Files	Coverage Δ
batchflow/models/eager_torch/losses/core.py	0% <0%> (ø)
batchflow/models/eager_torch/unet.py	0% <0%> (ø)
batchflow/models/eager_torch/encoder_decoder.py	0% <0%> (ø)
batchflow/models/eager_torch/resnet.py	0% <0%> (ø)
batchflow/models/eager_torch/layers/__init__.py	0% <0%> (ø)
batchflow/models/eager_torch/losses/__init__.py	0% <0%> (ø)
batchflow/models/eager_torch/layers/conv.py	0% <0%> (ø)
batchflow/models/eager_torch/layers/pooling.py	0% <0%> (ø)
batchflow/models/eager_torch/base.py	0% <0%> (ø)
batchflow/models/eager_torch/utils.py	0% <0%> (ø)
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 79ead40...61bed69. Read the comment docs.

[SergeyTsimfer]

Implemented #366

Something weird is happening with padding..