I am doing PCA on CIFAR 10 image on IBM WATSON Studio Free version so I uploaded the python file for downloading the CIFAR10 on the studio

pic below. 
[![enter image description here](https://i.stack.imgur.com/eoLz7.jpg)](https://i.stack.imgur.com/eoLz7.jpg) 

But when I trying to import `cache` the following error is showing.
pic below-
[![enter image description here](https://i.stack.imgur.com/hB5e6.jpg)](https://i.stack.imgur.com/hB5e6.jpg) 

After spending some time on google I find a solution but I can't understand it. 
link 
<https://dataplatform.cloud.ibm.com/docs/content/wsj/analyze-data/add-script-to-notebook.html>

```
the solution is as follows:- 
Click the Add Data icon (Shows the Add Data icon), and then browse the script file or drag it into your notebook sidebar.

Click in an empty code cell in your notebook and then click the Insert to code link below the file. Take the returned string, and write to a file in the file system that comes with the runtime session.

To import the classes to access the methods in a script in your notebook, use the following command:

For Python:

from <python file name> import <class name>

```

I can't understand this line 

` and write to a file in the file system that comes with the runtime session.``

Where can I find the file that comes with runtime session? Where is the file system located?

Can anyone plz help me in this with the details where to find that file