Build complex AI systems with declarative programming, optimize prompts automatically, create modular RAG systems and agents with DSPy - Stanford NLP's framework for systematic LM programming
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Build complex AI systems with declarative programming, optimize prompts automatically, create modular RAG systems and agents with DSPy - Stanford NLP's framework for systematic LM programming
Build complex AI systems with multiple components and workflows
Program LMs declaratively instead of manual prompt engineering
Optimize prompts automatically using data-driven methods
Create modular AI pipelines that are maintainable and portable
Improve model outputs systematically with optimizers
Build RAG systems, agents, or classifiers with better reliability
GitHub Stars: 22,000+ | Created By: Stanford NLP
Installation
# Stable release
pip install dspy
# Latest development version
pip install git+https://github.com/stanfordnlp/dspy.git
# With specific LM providers
pip install dspy[openai] # OpenAI
pip install dspy[anthropic] # Anthropic Claude
pip install dspy[all] # All providers
Quick Start
Basic Example: Question Answering
import dspy
# Configure your language model
lm = dspy.Claude(model="claude-sonnet-4-6")
dspy.settings.configure(lm=lm)
# Define a signature (input → output)classQA(dspy.Signature):
"""Answer questions with short factual answers."""
question = dspy.InputField()
answer = dspy.OutputField(desc="often between 1 and 5 words")
# Create a module
qa = dspy.Predict(QA)
# Use it
response = qa(question="What is the capital of France?")
print(response.answer) # "Paris"
Chain of Thought Reasoning
import dspy
lm = dspy.Claude(model="claude-sonnet-4-6")
dspy.settings.configure(lm=lm)
# Use ChainOfThought for better reasoning
(dspy.Signature):
problem = dspy.InputField()
answer = dspy.OutputField(desc=)
cot = dspy.ChainOfThought(MathProblem)
response = cot(problem=)
(response.rationale)
(response.answer)
"If John has 5 apples and gives 2 to Mary, how many does he have?"
print
# Shows reasoning steps
print
# "3"
Core Concepts
1. Signatures
Signatures define the structure of your AI task (inputs → outputs):
# Inline signature (simple)
qa = dspy.Predict("question -> answer")
# Class signature (detailed)classSummarize(dspy.Signature):
"""Summarize text into key points."""
text = dspy.InputField()
summary = dspy.OutputField(desc="bullet points, 3-5 items")
summarizer = dspy.ChainOfThought(Summarize)
When to use each:
Inline: Quick prototyping, simple tasks
Class: Complex tasks, type hints, better documentation
2. Modules
Modules are reusable components that transform inputs to outputs:
dspy.Predict
Basic prediction module:
predictor = dspy.Predict("context, question -> answer")
result = predictor(context="Paris is the capital of France",
question="What is the capital?")
dspy.ChainOfThought
Generates reasoning steps before answering:
cot = dspy.ChainOfThought("question -> answer")
result = cot(question="Why is the sky blue?")
print(result.rationale) # Reasoning stepsprint(result.answer) # Final answer
dspy.ReAct
Agent-like reasoning with tools:
from dspy.predict import ReAct
classSearchQA(dspy.Signature):
"""Answer questions using search."""
question = dspy.InputField()
answer = dspy.OutputField()
defsearch_tool(query: str) -> str:
"""Search Wikipedia."""# Your search implementationreturn results
react = ReAct(SearchQA, tools=[search_tool])
result = react(question="When was Python created?")
dspy.ProgramOfThought
Generates and executes code for reasoning:
pot = dspy.ProgramOfThought("question -> answer")
result = pot(question="What is 15% of 240?")
# Generates: answer = 240 * 0.15
3. Optimizers
Optimizers improve your modules automatically using training data:
BootstrapFewShot
Learns from examples:
from dspy.teleprompt import BootstrapFewShot
# Training data
trainset = [
dspy.Example(question="What is 2+2?", answer="4").with_inputs("question"),
dspy.Example(question="What is 3+5?", answer="8").with_inputs("question"),
]
# Define metricdefvalidate_answer(example, pred, trace=None):
return example.answer == pred.answer
# Optimize
optimizer = BootstrapFewShot(metric=validate_answer, max_bootstrapped_demos=3)
optimized_qa = optimizer.compile(qa, trainset=trainset)
# Now optimized_qa performs better!
from dspy.teleprompt import BootstrapFinetune
optimizer = BootstrapFinetune(metric=validate_answer)
optimized_module = optimizer.compile(qa, trainset=trainset)
# Exports training data for fine-tuning
4. Building Complex Systems
Multi-Stage Pipeline
import dspy
classMultiHopQA(dspy.Module):
def__init__(self):
super().__init__()
self.retrieve = dspy.Retrieve(k=3)
self.generate_query = dspy.ChainOfThought("question -> search_query")
self.generate_answer = dspy.ChainOfThought("context, question -> answer")
defforward(self, question):
# Stage 1: Generate search query
search_query = self.generate_query(question=question).search_query
# Stage 2: Retrieve context
passages = self.retrieve(search_query).passages
context = "\n".join(passages)
# Stage 3: Generate answer
answer = self.generate_answer(context=context, question=question).answer
return dspy.Prediction(answer=answer, context=context)
# Use the pipeline
qa_system = MultiHopQA()
result = qa_system(question="Who wrote the book that inspired the movie Blade Runner?")
# Different models for different tasks
cheap_lm = dspy.OpenAI(model="gpt-3.5-turbo")
strong_lm = dspy.Claude(model="claude-sonnet-4-6")
# Use cheap model for retrieval, strong model for reasoningwith dspy.settings.context(lm=cheap_lm):
context = retriever(question)
with dspy.settings.context(lm=strong_lm):
answer = generator(context=context, question=question)
Common Patterns
Pattern 1: Structured Output
from pydantic import BaseModel, Field
classPersonInfo(BaseModel):
name: str = Field(description="Full name")
age: int = Field(description="Age in years")
occupation: str = Field(description="Current job")
classExtractPerson(dspy.Signature):
"""Extract person information from text."""
text = dspy.InputField()
person: PersonInfo = dspy.OutputField()
extractor = dspy.TypedPredictor(ExtractPerson)
result = extractor(text="John Doe is a 35-year-old software engineer.")
print(result.person.name) # "John Doe"print(result.person.age) # 35
Pattern 2: Assertion-Driven Optimization
import dspy
from dspy.primitives.assertions import assert_transform_module, backtrack_handler
classMathQA(dspy.Module):
def__init__(self):
super().__init__()
self.solve = dspy.ChainOfThought("problem -> solution: float")
defforward(self, problem):
solution = self.solve(problem=problem).solution
# Assert solution is numeric
dspy.Assert(
isinstance(float(solution), float),
"Solution must be a number",
backtrack=backtrack_handler
)
return dspy.Prediction(solution=solution)
Pattern 3: Self-Consistency
import dspy
from collections import Counter
classConsistentQA(dspy.Module):
def__init__(self, num_samples=5):
super().__init__()
self.qa = dspy.ChainOfThought("question -> answer")
self.num_samples = num_samples
defforward(self, question):
# Generate multiple answers
answers = []
for _ inrange(self.num_samples):
result = self.qa(question=question)
answers.append(result.answer)
# Return most common answer
most_common = Counter(answers).most_common(1)[0][0]
return dspy.Prediction(answer=most_common)
# Start with Predict
qa = dspy.Predict("question -> answer")
# Add reasoning if needed
qa = dspy.ChainOfThought("question -> answer")
# Add optimization when you have data
optimized_qa = optimizer.compile(qa, trainset=data)
# Create diverse training examples
trainset = [
dspy.Example(question="factual", answer="...).with_inputs("question"),
dspy.Example(question="reasoning", answer="...").with_inputs("question"),
dspy.Example(question="calculation", answer="...").with_inputs("question"),
]
# Use validation set for metric
def metric(example, pred, trace=None):
return example.answer in pred.answer
