Cost tracking across runs in LangChain - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the class used for tracking costs in LangChain.

LangChain

from langchain.callbacks import [1]

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AMemoryBuffer

BCallbackManager

CCostTracker

DRunLogger

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated classes like CallbackManager or MemoryBuffer.

Using a class name that does not exist in langchain.callbacks.

The CostTracker class is used to track costs across runs in LangChain.

2fill in blank

medium

Complete the code to create a new cost tracker instance.

LangChain

tracker = [1]()

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ARunManager

BCallbackHandler

CMemoryBuffer

DCostTracker

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated classes like RunManager or CallbackHandler.

Forgetting to instantiate the class.

To track costs, you create an instance of CostTracker.

3fill in blank

hard

Fix the error in the code to add the cost tracker to the callback manager.

LangChain

callback_manager = CallbackManager(callbacks=[[1]])

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Atracker

BCostTracker

CCallbackHandler

Drun_manager

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the class name instead of the instance.

Passing unrelated variables.

You must pass the instance tracker to the callbacks list, not the class name.

4fill in blank

hard

Fill both blanks to update the cost tracker after a run and then print the total cost.

LangChain

tracker.[1](run)
print(tracker.[2])

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Aon_run_end

Btotal_cost

Cstart_run

Dcost

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method that does not exist like 'start_run'.

Trying to print a method instead of a property.

Use on_run_end to update the tracker after a run, and total_cost to get the current total cost.

5fill in blank

hard

Fill all three blanks to reset the cost tracker, run a new process, and then print the updated cost.

LangChain

tracker.[1]()
result = process.run(input)
tracker.[2](result)
print(tracker.[3])

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Areset

Bon_run_end

Ctotal_cost

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to reset before running.

Using wrong method names for updating or printing cost.

First, reset the tracker with reset(). Then update it with on_run_end() after the run. Finally, print the total_cost.