如何理解张量流量张量板直方图？

我想知道如何理解张量流图/生成的直方图.可在此处找到此代码. 此图表易于理解准确性和损失是直接理解的.

Accuracy- Accuracy of current state of network for given train data.
Higher is better

Accuracy/Validation -  Accuracy of current state of network for given Validation data which is 
not seen by network before. Higher is better

Loss- Loss of network on train data. Lower is better.
Loss/Valadation - Loss of network on test data. Lower is better.
If loss increases it's a sign of over-fitting.
Conv2d/L2-Loss - Loss of particular layer wrt train data. 

基本上图表表示什么以及如何使用它来理解我的网络,如果可能的话,我可以做些什么改进来改进它.