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HParams dashboard shows no data when using Histogram dashboard.

Ray version and other system information (Python version, TensorFlow version, OS):
Ray version: 0.9.0.dev0
Python version: 3.7.5
TensorFlow version: 2.1.0

Reproduction

I modified the mnist_pytorch_trainable.py to log model parameters to tensorboad.

Modification as follow:

def _train(self):
        train(self.model, self.optimizer, self.train_loader)
        acc = test(self.model, self.test_loader)
        result = {"mean_accuracy": acc}
        for tag, value in self.model.named_parameters():
                    tag = tag.replace('.', '/')
                    result[tag] = value.data.cpu().tolist()
        return result

If I removed the modification, the HParams dashboard is back to normal.

Am I doing in the wrong way?