Question:
According to the source text, why is it valuable to examine how a basic system functions even if it is not the best system?

Sample answer:
It is valuable because examining the basic system helps you quickly find clues that point you toward the most promising directions for investing your time.

Key points:
- Find clues.
- Show most promising directions.
- Guide where to invest time.

Rubric:
Must mention that examining the system provides clues or shows promising directions for time investment.

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Most machine learning problems contain clues about which ideas are useful to try and which ideas are not useful to try. Learning to read these clues can save months or years of development time.

Machine Learning Problems Leave Strategy Clues

Machine Learning Yearning, a free ebook from Andrew Ng, teaches you how to structure Machine Learning projects.
https://www.deeplearning.ai/machine-learning-yearning/

Note: The content of the book is aligned with the Coursera Deeplearning.ai specialization.  https://www.deeplearning.ai/deep-learning-specialization/ 

Machine Learning Yearning (Deeplearning.ai)

Benefit of Reading Clues

Value of Basic System

Finding Promising Directions _____

Concepts and Benefits of ML Clues

Using Clues to Guide Development

Question:
Explain why Andrew Ng emphasizes looking for 'clues' in machine learning problems, and describe how examining a basic system contributes to this process.

Sample answer:
Andrew Ng emphasizes looking for clues because they indicate which ideas are worth trying and which are not. Learning to read these clues can save developers months or years of wasted effort. Examining a basic system, even a flawed one, is crucial because it is through this examination that a developer can quickly uncover these clues, revealing the most promising directions for future development.

Key points:
- Clues tell you what is useful and not useful to try.
- Reading clues saves months or years of time.
- Examining a basic system reveals clues about promising directions.

Rubric:
The essay must explain the primary benefit of finding clues (saving development time) and how a basic system helps uncover them (showing promising directions).

Analyzing the Value of Clues

Case context:
You have built an initial, basic spam classification system. It is currently making many errors and is far from the performance you eventually want to achieve. Your manager suggests discarding it entirely and spending the next six months researching a state-of-the-art complex model from scratch.

Question:
Based on Andrew Ng's advice, what should you do instead with the current basic system, and what benefit will this provide?

Sample answer:
Instead of discarding it, you should examine how the current basic system functions. By analyzing its errors and behavior, you will quickly find clues that show the most promising directions in which to invest your time, potentially saving months or years of misdirected development.

Key points:
- Do not discard the basic system.
- Examine how the basic system functions.
- Use the examination to find clues for promising directions.
- This approach saves development time.

Rubric:
The response should advise examining the basic system rather than discarding it, and state that this will reveal clues or promising directions.

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