solution-4: Dev (#121)

* Dev fix generate_metadata (#106)

* fix generate_metadata

* temp fix in callbacks

* Dev loader refactor (#111)

* refactored loaders, fixed weighed loss calculation

* updated config

* reverted resnet 152 to 32 filters with no dropout

* removed print

* back to 1000 valid size

* back to old batch size

* back other params

* config

* fix bug in loaders (#112)

* fix validation bug (#115)

* Dev tta (#116)

* scheleton added

* transformation and inverse done

* tta working

* Dev validation using mAP precision (#117)

* mege TTA with mAP validation

* mAP validation

* fix mAP valid in eval (#120)