Based on the provided Python script, here are the identified issues related to the hint (unfinished tasks in a Python script file):

1. **Issue: Unspecified version setup**
    - **Evidence:** ```# {TODO}: Set up version.```
    - **Description:** The script contains a TODO comment indicating that the dataset version needs to be specified. However, the version is already specified as '0.1.0' right below the TODO comment. This is likely an oversight, and the TODO comment should be removed to avoid confusion.

2. **Issue: Downloads the data and defines the splits not implemented fully**
    - **Evidence:** ```# {TODO}: Downloads the data and defines the splits```
    - **Description:** There is a TODO comment in the `_split_generators` method indicating that the process for downloading the data and defining the splits needs to be detailed. This seems to have been partially addressed, as the method includes code to download the training and test datasets and defines the TRAIN and TEST splits. However, the presence of the TODO comment suggests that the implementation may not be fully complete or reviewed.

3. **Issue: Yields (key, example) tuples from the dataset not fully implemented**
    - **Evidence:** ```# {TODO}: Yields (key, example) tuples from the dataset```
    - **Description:** The `_generate_examples` method contains a TODO comment indicating that the method for yielding (key, example) tuples from the dataset needs to be implemented. However, the method already includes the implementation for yielding these tuples. This suggests that either the method is not fully implemented according to the required functionality, or the TODO comment was not removed after the method's completion.

The presence of these TODO comments either indicates unfinished tasks or oversight in removing the comments post-completion. It's also important to review whether the existing implementation for code sections with TODO comments fully meets the intended functionality and quality standards.