name 'train_dataset' is not defined

As an AI language model, I cannot know the exact context in which you are receiving the error message "name 'train_dataset' is not defined." However, typically, this error message occurs when you try to use a variable or object that has not been defined or initialized in your code.

For instance, if you are trying to use the variable "train_dataset" in your code, but you have not defined it earlier in your script, then Python would throw this error.

To fix this error, you need to define the variable "train_dataset" before using it in your code. You can do this by initializing the variable with a value or creating an instance of an object with this name.

Here's an example of how to define and initialize a variable named "train_dataset":

train_dataset = ["data1", "data2", "data3"]

Alternatively, you can also create an instance of an object with the name "train_dataset" and use it in your code.

If you are still having trouble with this error, please provide more context or code snippets, and I would be happy to help you further.