i have MNIST dataset and i am trying to visualise it using pyplot. The dataset is in `cvs` format where each row is one image of 784 pixels. i want to visualise it in `pyplot` or `opencv` in the 28\*28 image format. I am trying directly using :

```
plt.imshow(X[2:],cmap =plt.cm.gray_r, interpolation = "nearest") 

```

but i its not working? any ideas on how should i approach this.