T2K-Felix

Results 2 issues of T2K-Felix

This PR: - only a test PR at the moment - fix for TF mobilenet grouped convolutions issue `tensorflow.python.framework.errors_impl.InvalidArgumentError: {{function_node __wrapped__Conv2DBackpropInput_device_/job:localhost/replica:0/task:0/device:CPU:0}} Gradients for grouped convolutions are not supported on CPU....

type: bug
module: models
framework: tensorflow
topic: character classification

This PR: - Remove all TensorFlow content - Add PyTorch as fixed dependency - Drop documentation versions which rely on TensorFlow backend - Remove conda which does not support PyTorch...

topic: documentation
topic: build
topic: ci
module: models
module: io
module: utils
topic: docker
ext: scripts
ext: tests
type: breaking change
module: datasets
ext: demo
ext: references
module: transforms
ext: api
topic: text detection
topic: text recognition
topic: character classification
ext: docs
module: contrib