PyTorch: TensorFlow Summary support

[lutzroeder]

Export PyTorch model to TensorFlow Event File and open out/event.out.tftevents* file:

import torchvision
import torch.utils.tensorboard
model = torchvision.models.resnet34(weights=torchvision.models.ResNet34_Weights.DEFAULT)
with torch.utils.tensorboard.SummaryWriter('out') as writer:
    writer.add_graph(model, torch.zeros([1, 3, 224, 224]))

Sample files:
events.out.tfevents.1606692323.b5c8f88cc7ee.58.2.zip
events.out.tfevents.1606696207.eba7c8084653.55.0.zip
events.out.tfevents.1617485839.39aaee5846c1.58.0.zip

See #638