Let health pill label indicate NaN/Infs more saliently (#1026)
Let health pill label indicate NaN/Infs more saliently (#1026)

* The label, which previously shows only min ~ max even for
  tensor values with NaNs and Infs, now will explicitly say
  how many NaNs and Infs there are if any of those exist.
qiuminxu/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,tensorflow/tensorboard,qiuminxu/tensorboard,qiuminxu/tensorboard,tensorflow/tensorboard