Chains (sequential, router) in Prompt Engineering / GenAI - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Sequential Chains

In a sequential chain, multiple steps are executed one after another. Which statement best describes how data flows through a sequential chain?

A All steps run independently and their outputs are combined at the end.

B Each step receives input from the previous step's output and passes its output to the next step.

C The first step receives all inputs and the last step produces all outputs without intermediate processing.

D Steps randomly select inputs from the original data without following order.

💡 Hint

Think about a relay race where one runner passes the baton to the next.

In sequential chains, each step depends on the previous step's output, passing data along in order.

❓ Model Choice

intermediate

Choosing a Router Chain Use Case

You want to build a system that decides which specialized model to use based on the input type (e.g., text, image, or audio). Which chain type is best suited for this task?

A Sequential chain that processes all inputs through every model in order.

B Parallel chain that runs all models simultaneously and averages their outputs.

C Router chain that selects the appropriate model based on input characteristics.

D Single model chain that handles all input types without selection.

💡 Hint

Consider a traffic controller directing cars to different lanes based on their type.

A router chain directs inputs to the best-suited model, improving efficiency and accuracy.

❓ Predict Output

advanced

Output of a Sequential Chain Code

What is the output of the following pseudo-code for a sequential chain?

Prompt Engineering / GenAI

def step1(x):
    return x + 2

def step2(y):
    return y * 3

input_value = 4
output = step2(step1(input_value))
print(output)

A 20

B 14

C 12

D 18

💡 Hint

Calculate step1 first, then use its output in step2.

step1(4) = 6; step2(6) = 18; so output is 18.

❓ Metrics

advanced

Evaluating Router Chain Performance

You have a router chain that directs inputs to three models. After testing, you get these accuracies: Model A: 90%, Model B: 85%, Model C: 80%. The router correctly routes 95% of inputs. What is the approximate overall accuracy of the router chain?

A 88.25%

B 92.50%

C 90.00%

D 85.75%

💡 Hint

Calculate weighted accuracy considering routing correctness and model accuracies.

Overall accuracy ≈ (router accuracy * average model accuracy) + (router error * random guess accuracy). Assuming random guess accuracy is low, main factor is router accuracy times average model accuracy.

🔧 Debug

expert

Debugging a Router Chain Routing Error

Given this router chain pseudo-code, what causes the routing error?

def router(input):
    if 'image' in input:
        return 'model_image'
    elif 'text' in input:
        return 'model_text'
    else:
        return 'model_default'

input_data = 'audio file'
selected_model = router(input_data)
print(selected_model)

A The router does not handle 'audio' inputs, so it returns 'model_default' which may not exist.

B The condition 'if "image" in input' causes a syntax error due to missing colon.

C The input_data variable is not defined before calling router.

D The router function returns a list instead of a string, causing a type error.

💡 Hint

Check how the router handles inputs not matching 'image' or 'text'.

The router returns 'model_default' for inputs like 'audio file', but if 'model_default' is not implemented, this causes an error.