Gridworld Examples 13.1 and 13.2

Treat the gridworld as the environment for applying REINFORCE, not as a separate replacement for the algorithm.

Programming

Why These Examples Matter

This section is a practice setting for REINFORCE. It applies the algorithm to the gridworlds introduced in Examples 13.1 and 13.2. The main learning move is therefore practical: identify the gridworld being used, recognize that REINFORCE is applied there, and connect that application with the results presented earlier or in the section.

Key point

Treat the gridworld as the environment for applying REINFORCE, not as a separate replacement for the algorithm.

Following the Application

How does the practice setting connect REINFORCE with the results reported for the gridworld examples?

Read the section as a chain. First, select one of the stated gridworld settings: the gridworld from Example 13.1 and/or the gridworld from Example 13.2. Next, understand that REINFORCE is applied in that setting. Finally, connect the application with the results presented earlier or in the section. The source establishes this connection without supplying the internal mechanics of REINFORCE.

What the Practice Establishes

The practice section establishes an application context: REINFORCE is used with the gridworlds from Examples 13.1 and 13.2, and that application is connected with reported results. This gives the learner a reference point for discussing what happened in those examples.

Established by this section	Not established by the source statement
The relevant practice settings are the gridworlds from Examples 13.1 and/or 13.2.	The internal mechanics of REINFORCE.
REINFORCE is applied to those gridworld settings.	A detailed account of how the algorithm operates internally.
The application is connected with results presented earlier or in the section.	Additional algorithm details that must be learned elsewhere.

Use this distinction to avoid asking the practice section to explain more than it states.

From Setting to Results

How do the named gridworld settings and the application of REINFORCE lead to the results discussed by the section?

Worked example

Classifying a Result Discussion

A discussion names the gridworld from Example 13.1, says that REINFORCE is applied there, and then refers to a result presented earlier. What role does each part play?

1
Identify the setting
The gridworld from Example 13.1 is the practice environment named by the section.
2
Identify the application
REINFORCE is the algorithm being applied to that gridworld.
3
Identify the connection
The result belongs to the application of REINFORCE in the stated gridworld setting.
4
Check the scope
Do not treat this description as a complete explanation of REINFORCE's internal mechanics.

Result

The discussion links a named gridworld, an application of REINFORCE, and a reported result while leaving detailed algorithm mechanics outside the stated scope.

This worked example does not add a new gridworld result. It demonstrates how to read the relationship already established by the source: the example supplies the setting, REINFORCE supplies the applied algorithm, and the reported result is interpreted as belonging to that application.

Mistakes in Reading the Section

Common mistake
Treating the gridworld as the algorithm
What it looks like
Describing the gridworld from Example 13.1 as if it were REINFORCE itself.
Why it fails
The gridworld is the setting in which REINFORCE is applied.
Do this instead
Name the gridworld as the practice environment and REINFORCE as the algorithm applied there.
Common mistake
Discussing a result without naming its gridworld setting
What it looks like
Referring only to a REINFORCE result without identifying whether the discussion concerns Example 13.1 or Example 13.2.
Why it fails
The section uses those gridworld examples as the reference point for the application and its results.
Do this instead
Anchor the discussion to the relevant gridworld example whenever the source identifies it.
Common mistake
Using the practice description as a substitute for algorithm instruction
What it looks like
Expecting this section alone to explain REINFORCE's internal mechanics.
Why it fails
The source statement establishes the application context, not the algorithm's internal mechanics.
Do this instead
Learn detailed algorithm mechanics from the material that covers them, while using this section to study the application context.

Practice Check

EASY

A learner says: “Examples 13.1 and 13.2 explain every internal step of REINFORCE.” Reframe the statement so that it matches the scope of this practice section.

Hints

Begin by naming what Examples 13.1 and 13.2 provide.
Then state what is applied in those settings.
Finish by identifying what the section connects to the application.

Your attempt (not saved)

Definition

A source-grounded answer is: Examples 13.1 and 13.2 provide gridworld settings in which REINFORCE is applied; the section connects that application with reported results, while its statement does not establish the algorithm's internal mechanics.

Key Takeaways

1
The practice settings are the gridworlds from Examples 13.1 and/or 13.2.
2
The central action is applying REINFORCE to those gridworlds.
3
The application is connected with results presented earlier or in the section.
4
The section establishes application context rather than REINFORCE's internal mechanics.
5
When discussing a result, use the relevant gridworld example as the reference point.

At a glance

Examples 13.1 and 13.2 supply the gridworld settings for practising REINFORCE.
The section's main purpose is to connect applying REINFORCE with reported results.
The gridworld is the application environment, not the algorithm itself.
The source describes the application context and does not establish REINFORCE's internal mechanics.
A careful result discussion identifies the relevant gridworld example before interpreting the application.

Related concepts

REINFORCE

More concepts starting with G