Sequential chains in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a simple sequential chain with two steps.

LangChain

from langchain.chains import SequentialChain
from langchain.llms import OpenAI

llm = OpenAI()

chain = SequentialChain(chains=[[1]], input_variables=["input"], output_variables=["output"])

Drag options to blanks, or click blank then click option'

ASequentialChain

Bchain1, chain2

Cllm

Dchain1

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the llm object directly instead of a chain.

Passing multiple chains without wrapping them in a list.

Using the class name instead of an instance.

The chains parameter expects a list of chain objects. Here, chain1 is a single chain object, so it should be passed as a list with one element. Since the code shows only one chain, the correct answer is chain1.

2fill in blank

medium

Complete the code to run the sequential chain with the correct input variable.

LangChain

result = chain.run([1]="Hello")

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Ainput

Boutput

Ctext

Dquery

Attempts:

3 left

💡 Hint

Common Mistakes

Using the output variable as input.

Using a variable name not defined in the chain.

The input variable for the sequential chain is named input, so you must pass the input value with the key input.

3fill in blank

hard

Fix the error in the code by choosing the correct method to add chains to the SequentialChain.

LangChain

from langchain.chains import SequentialChain

chain = SequentialChain()
chain.[1](chain1)

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Aadd

Badd_chain

Cappend

Dextend

Attempts:

3 left

💡 Hint

Common Mistakes

Using list methods like append or extend which are not defined.

Using a method name that does not exist in the class.

The SequentialChain class uses the add method to add a chain to the sequence.

4fill in blank

hard

Fill both blanks to create a SequentialChain with two chains and specify the correct input and output variables.

LangChain

chain = SequentialChain(chains=[[1], [2]], input_variables=["input"], output_variables=["final_output"])

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Achain1

Bchain2

Cchain3

Dchain4

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same chain twice.

Using chains not defined in the code.

To create a sequential chain with two chains, you list them inside the chains parameter. Here, chain1 and chain2 are the correct chains to use.

5fill in blank

hard

Fill all three blanks to define a SequentialChain with input, output, and intermediate variables correctly.

LangChain

chain = SequentialChain(
    chains=[[1], [2]],
    input_variables=[[3]],
    output_variables=["result"]
)

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AchainA

BchainB

C"user_input"

D"input_text"

Attempts:

3 left

💡 Hint

Common Mistakes

Not quoting the input variable name.

Using undefined chain names.

The chains are chainA and chainB. The input variable is named input_text as a string, so it must be passed with quotes.