Version: 0.8

📚 Tecton Quickstart Tutorial

Tecton helps you build and productionize real-time ML models by making it easy to define, test, and and deploy features for training and serving.

Let’s see how quickly we can build a real-time fraud detection model and bring it online.

In this tutorial we will:

Connect to data on S3
Define and test features
Generate a training dataset and train a model
Productionize our features for real-time serving
Run real-time inference to predict fraudulent transactions

This tutorial is expected to take about 30 minutes (record time for building a real-time ML application 😎).

tip

Most of this tutorial is intended to be run in a notebook. Some steps will explicitly note to run commands in your terminal.

Be sure to install the Tecton SDK before getting started. You will also need to install the following packages, used for reading data from S3:

pip install s3fs fsspec

Before you start, run tecton login [my-account].tecton.ai in your CLI. Be sure to fill in your organization's Tecton account name.

🔎 Examine raw data

First let's examine some historical transaction data the we have available on S3.

import pandas as pd

df = pd.read_parquet("s3://tecton.ai.public/tutorials/fraud_demo/transactions/data.pq", storage_options={"anon": True})

display(df.head(5))

	user_id	transaction_id	category	amt	is_fraud	merchant	merch_lat	merch_long	timestamp
0	user_884240387242	3eb88afb219c9a10f5130d0b89a13451	gas_transport	68.23	0	fraud_Kutch, Hermiston and Farrell	42.71	-78.3386	2023-06-20 10:26:41
1	user_268514844966	72e23b9193f97c2ba654854a66890432	misc_pos	32.98	0	fraud_Lehner, Reichert and Mills	39.1536	-122.364	2023-06-20 12:57:20
2	user_722584453020	db7a41ce2d16a4452c973418d9e544b1	home	4.5	0	fraud_Koss, Hansen and Lueilwitz	33.0332	-105.746	2023-06-20 14:49:59
3	user_337750317412	edfc42f7bc4b86d8c142acefb88c4565	misc_pos	7.68	0	fraud_Buckridge PLC	40.6828	-88.8084	2023-06-20 14:50:13
4	user_934384811883	93d28b6d2e5afebf9c40304aa709ab29	kids_pets	68.97	1	fraud_Lubowitz-Walter	39.1443	-96.125	2023-06-20 15:55:09

👩‍💻 Define and test features locally

In our data, we see that there's information on users' transactions over time.

Let's use this data to create the following features:

A user's average transaction amount over 1, 3, and 7 days.
A user's total transaction count over 1, 3, and 7 days.

To build these features, we will define a "Batch Source" and "Batch Feature View" using Tecton's Feature Engineering Framework.

A Feature View is how we define our feature logic and give Tecton the information it needs to productionize, monitor, and manage features.

Tecton's development workflow allows you to build and test features, as well as generate training data entirely in a notebook! Let's try it out.

from tecton import Entity, BatchSource, FileConfig, batch_feature_view, Aggregation
from tecton.types import Field, String, Timestamp, Float64
from datetime import datetime, timedelta


transactions = BatchSource(
    name="transactions",
    batch_config=FileConfig(
        uri="s3://anonymous@tecton.ai.public/tutorials/fraud_demo/transactions/data.pq",
        file_format="parquet",
        timestamp_field="timestamp",
    ),
)

# An entity defines the concept we are modeling features for
# The join keys will be used to aggregate, join, and retrieve features
user = Entity(name="user", join_keys=["user_id"])

# We use SQL to transform the raw data and Tecton aggregations to efficiently and accurately compute metrics across raw events
# Feature View decorators contain a wide range of parameters for materializing, cataloging, and monitoring features
@batch_feature_view(
    description="User transaction metrics over 1, 3 and 7 days",
    sources=[transactions],
    entities=[user],
    mode="pandas",
    aggregation_interval=timedelta(days=1),
    aggregations=[
        Aggregation(function="mean", column="amt", time_window=timedelta(days=1)),
        Aggregation(function="mean", column="amt", time_window=timedelta(days=3)),
        Aggregation(function="mean", column="amt", time_window=timedelta(days=7)),
        Aggregation(function="count", column="amt", time_window=timedelta(days=1)),
        Aggregation(function="count", column="amt", time_window=timedelta(days=3)),
        Aggregation(function="count", column="amt", time_window=timedelta(days=7)),
    ],
    schema=[Field("user_id", String), Field("timestamp", Timestamp), Field("amt", Float64)],
)
def user_transaction_metrics(transactions):
    return transactions[["user_id", "timestamp", "amt"]]


# After we define local objects, we use `.validate()` to check the correctness of the definition
# and make it ready to query
user_transaction_metrics.validate()

BatchFeatureView 'user_transaction_metrics': Validating 3 dependencies.
    BatchSource 'transactions': Deriving schema.
    BatchSource 'transactions': Successfully validated.
    Entity 'user': Successfully validated.
    Transformation 'user_transaction_metrics': Successfully validated.
BatchFeatureView 'user_transaction_metrics': Successfully validated.

🧪 Test features interactively

Now that we've defined and validated our Feature View, we can use get_historical_features to produce a range of feature values and check out the data.

start = datetime(2022, 1, 1)
end = datetime(2022, 2, 1)

df = user_transaction_metrics.get_historical_features(start_time=start, end_time=end).to_pandas()

display(df.head(5))

	user_id	amt_mean_1d_1d	amt_mean_3d_1d	amt_mean_7d_1d	transaction_count_1d_1d	transaction_count_3d_1d	transaction_count_7d_1d	timestamp	_effective_timestamp
0	user_131340471060	21.07	93.395	49.2267	1	2	6	2022-01-01 00:00:00	2022-01-01 00:00:00
1	user_131340471060	144.45	110.413	71.258	1	3	5	2022-01-02 00:00:00	2022-01-02 00:00:00
2	user_131340471060	4.14	56.5533	69.26	1	3	5	2022-01-03 00:00:00	2022-01-03 00:00:00
3	user_131340471060	15.1	54.5633	60.2333	1	3	6	2022-01-04 00:00:00	2022-01-04 00:00:00
4	user_131340471060	91.34	91.34	55.22	1	1	5	2022-01-07 00:00:00	2022-01-07 00:00:00

🧮 Generate training data

We'll build our training dataset from labeled historical transactions and try to predict the "is_fraud" column for a given transaction.

Let's load up some training events.

training_events = pd.read_parquet(
    "s3://tecton.ai.public/tutorials/fraud_demo/transactions/data.pq", storage_options={"anon": True}
)[["user_id", "timestamp", "amt", "is_fraud"]].head(1000)

display(training_events.head(5))

	user_id	timestamp	amt	is_fraud
0	user_884240387242	2023-06-20 10:26:41	68.23	0
1	user_268514844966	2023-06-20 12:57:20	32.98	0
2	user_722584453020	2023-06-20 14:49:59	4.5	0
3	user_337750317412	2023-06-20 14:50:13	7.68	0
4	user_934384811883	2023-06-20 15:55:09	68.97	1

Next, let's ask Tecton to join the feature we just created into our labeled events. Tecton will perform a time travel join to fetch the point-in-time correct feature values.

To do this we will create a "Feature Service" which defines the list of features that will be used by our model.

We can call get_historical_features(training_events) on the Feature Service to get historically accurate features for each event.

from tecton import FeatureService


fraud_detection_feature_service = FeatureService(
    name="fraud_detection_feature_service", features=[user_transaction_metrics]
)

fraud_detection_feature_service.validate()

training_data = fraud_detection_feature_service.get_historical_features(training_events).to_pandas().fillna(0)
display(training_data.head(5))

FeatureService 'fraud_detection_feature_service': Successfully validated.

	user_id	timestamp	amt	is_fraud	user_transaction_metrics__amt_mean_1d_1d	user_transaction_metrics__amt_mean_3d_1d	user_transaction_metrics__amt_mean_7d_1d	user_transaction_metrics__transaction_count_1d_1d	user_transaction_metrics__transaction_count_3d_1d	user_transaction_metrics__transaction_count_7d_1d
0	user_131340471060	2023-06-21 13:57:50	73.8	0	96.85	103.373	103.373	1	3	3
1	user_131340471060	2023-06-27 00:52:08	46.48	0	0	0	85.325	0	0	2
2	user_131340471060	2023-07-05 10:42:35	157.82	0	0	0	0	0	0	0
3	user_131340471060	2023-07-11 02:06:55	3.53	0	0	0	157.82	0	0	1
4	user_131340471060	2023-07-16 01:04:41	6.42	1	0	0	3.53	0	0	1

🧠 Train a model

Once we have our training data set from Tecton, we can use whatever framework we want for training the model.

In the example below, we'll train a simple Logistic Regression model using sklearn!

tip

This step may require that you install sklearn via:

pip install scikit-learn

from sklearn.pipeline import make_pipeline
from sklearn.impute import SimpleImputer
from sklearn.preprocessing import OneHotEncoder, StandardScaler
from sklearn.compose import ColumnTransformer
from sklearn.linear_model import LogisticRegression
from sklearn.model_selection import train_test_split
from sklearn import metrics


df = training_data.drop(["user_id", "timestamp", "amt"], axis=1)

X = df.drop("is_fraud", axis=1)
y = df["is_fraud"]

X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.3, random_state=42)

num_cols = X_train.select_dtypes(exclude=["object"]).columns.tolist()
cat_cols = X_train.select_dtypes(include=["object"]).columns.tolist()

num_pipe = make_pipeline(SimpleImputer(strategy="median"), StandardScaler())

cat_pipe = make_pipeline(
    SimpleImputer(strategy="constant", fill_value="N/A"), OneHotEncoder(handle_unknown="ignore", sparse=False)
)

full_pipe = ColumnTransformer([("num", num_pipe, num_cols), ("cat", cat_pipe, cat_cols)])

model = make_pipeline(full_pipe, LogisticRegression(max_iter=1000, random_state=42))

model.fit(X_train, y_train)

y_predict = model.predict(X_test)

print(metrics.classification_report(y_test, y_predict, zero_division=0))

	precision	recall	f1-score	support
0	0.88	1.00	0.94	265
1	0.00	0.00	0.00	35
accuracy			0.88	300
macro avg	0.44	0.50	0.47	300
weighted avg	0.78	0.88	0.83	300

Of course, you can continue building iterating on features and retraining your model until you are ready to productionize.

🚀 Apply your Tecton application to production

Tecton objects get registered via a declarative workflow. Features are defined as code in a repo and applied to a workspace in a Tecton account using the Tecton CLI. This approach enables productionisation best practices such as "features as code," CI/CD, and unit testing.

Install the Tecton CLI

This section will require you to install the Tecton CLI via:

pip install tecton

We recommend that you first create a virtual environment for the installation.

Check out Installing the Tecton CLI for more information and installing the CLI.

1. Create a Tecton Feature Repository

Let's switch over from our notebook to a terminal and create a new Tecton Feature Repository. For now we will put all our definitions in a single file.

✅ Run these commands to create a new Tecton repo.

mkdir tecton-feature-repo
cd tecton-feature-repo
touch features.py
tecton init

2. Fill in features.py and enable materialization

✅ Now copy & paste the definition of the Tecton objects you created in your notebook to features.py (copied below).

On our Feature View we've added four parameters to enable backfilling and ongoing materialization to the online and offline Feature Store:

online=True
offline=True
feature_start_time=datetime(2023,1,1)
batch_schedule=timedelta(days=1)

When we apply our changes to a Live Workspace, Tecton will automatically kick off jobs to backfill feature data from feature_start_time. Frontfill jobs will then run on the defined batch_schedule.

note

Besides the new materialization parameters, the code below is exactly the same as our definitions above. No changes are required when moving from interactive development to productionisation!

features.py

from tecton import Entity, BatchSource, FileConfig, batch_feature_view, Aggregation, FeatureService
from tecton.types import Field, String, Timestamp, Float64
from datetime import datetime, timedelta


transactions = BatchSource(
    name="transactions",
    batch_config=FileConfig(
        uri="s3://anonymous@tecton.ai.public/tutorials/fraud_demo/transactions/data.pq",
        file_format="parquet",
        timestamp_field="timestamp",
    ),
)

# An entity defines the concept we are modeling features for
# The join keys will be used to aggregate, join, and retrieve features
user = Entity(name="user", join_keys=["user_id"])

# We use SQL to transform the raw data and Tecton aggregations to efficiently and accurately compute metrics across raw events
# Feature View decorators contain a wide range of parameters for materializing, cataloging, and monitoring features
@batch_feature_view(
    description="User transaction metrics over 1, 3 and 7 days",
    sources=[transactions],
    entities=[user],
    mode="pandas",
    aggregation_interval=timedelta(days=1),
    aggregations=[
        Aggregation(function="mean", column="amt", time_window=timedelta(days=1)),
        Aggregation(function="mean", column="amt", time_window=timedelta(days=3)),
        Aggregation(function="mean", column="amt", time_window=timedelta(days=7)),
        Aggregation(function="count", column="amt", time_window=timedelta(days=1)),
        Aggregation(function="count", column="amt", time_window=timedelta(days=3)),
        Aggregation(function="count", column="amt", time_window=timedelta(days=7)),
    ],
    schema=[Field("user_id", String), Field("timestamp", Timestamp), Field("amt", Float64)],
    online=True,
    offline=True,
    feature_start_time=datetime(2023, 1, 1),
    batch_schedule=timedelta(days=1),
)
def user_transaction_metrics(transactions):
    return transactions[["user_id", "timestamp", "amt"]]


fraud_detection_feature_service = FeatureService(
    name="fraud_detection_feature_service", features=[user_transaction_metrics]
)

3. Apply your changes to a new workspace

Our last step is to login to your organization's Tecton account and apply our repo to a workspace!

✅ Run the following commands in your terminal to create a workspace and apply your changes:

caution

The tecton apply step will kick off jobs in your connected data platform and incur some cost, however the size of the data being transformed and materialized is relatively small (~700 records per month in the raw data).

tecton login [your-org-account-name].tecton.ai
tecton workspace create [your-name]-quickstart --live
tecton apply

Using workspace "[your-name]-quickstart" on cluster https://app.tecton.ai
✅ Imported 1 Python module from the feature repository
✅ Imported 1 Python module from the feature repository
⚠️  Running Tests: No tests found.
✅ Collecting local feature declarations
✅ Performing server-side feature validation: Initializing.
 ↓↓↓↓↓↓↓↓↓↓↓↓ Plan Start ↓↓↓↓↓↓↓↓↓↓

  + Create Batch Data Source
    name:           transactions

  + Create Entity
    name:           user

  + Create Transformation
    name:           user_transaction_metrics
    description:    Trailing average transaction amount over 1, 3 and 7 days

  + Create Batch Feature View
    name:           user_transaction_metrics
    description:    Trailing average transaction amount over 1, 3 and 7 days
    materialization: 11 backfills, 1 recurring batch job
    > backfill:     10 Backfill jobs 2021-12-25 00:00:00 UTC to 2023-08-16 00:00:00 UTC writing to the Offline Store
                    1 Backfill job 2023-08-16 00:00:00 UTC to 2023-08-23 00:00:00 UTC writing to both the Online and Offline Store
    > incremental:  1 Recurring Batch job scheduled every 1 day writing to both the Online and Offline Store

  + Create Feature Service
    name:           fraud_detection_feature_service

 ↑↑↑↑↑↑↑↑↑↑↑↑ Plan End ↑↑↑↑↑↑↑↑↑↑↑↑
 Generated plan ID is 8d01ad78e3194a5dbd3f934f04d71564
 View your plan in the Web UI: https://app.tecton.ai/app/[your-name]-quickstart/plan-summary/8d01ad78e3194a5dbd3f934f04d71564
 ⚠️  Objects in plan contain warnings.

Note: Updates to Feature Services may take up to 60 seconds to be propagated to the real-time feature-serving endpoint.
Note: This workspace ([your-name]-quickstart) is a "Live" workspace. Applying this plan may result in new materialization jobs which will incur costs. Carefully examine the plan output before applying changes.
Are you sure you want to apply this plan to: "[your-name]-quickstart"? [y/N]> y
🎉 all done!

🟢 Check on backfilling status

Now that we've applied our features to a live workspace and enabled materialization to the online and offline store, we can check on the status of backfill jobs in the Tecton Web UI.

This can be found at:

https://[your-org-account-name].tecton.ai/app/repo/[your-workspace-name]/features/user_transaction_metrics/materialization

Once the backfill jobs have completed, we can fetch feature values online!

Materialization Jobs

⚡️ Create a function to retrieve features from Tecton's REST API

Now let's use Tecton's REST API to retrieve features at low latency.

To do this, you will first need to create a new Service Account and give it access to read features from your workspace.

Follow these commands in your terminal:

tecton service-account create --name "[your-name]-quickstart" --description "Quickstart service account"
tecton access-control assign-role -r consumer -w [your-name]-quickstart -s [service account id from last command]

You will use the API key from the first command in the cell below where we define a function to retrieve online feature data for a given user.

import requests, json


def get_online_feature_data(user_id):
    TECTON_API_KEY = "[your-api-key]"
    WORKSPACE_NAME = "[your-workspace-name]"
    ACCOUNT_NAME = "[your-org-account-name]"

    headers = {"Authorization": "Tecton-key " + TECTON_API_KEY}

    request_data = f"""{{
        "params": {{
            "feature_service_name": "fraud_detection_feature_service",
            "join_key_map": {{"user_id": "{user_id}"}},
            "metadata_options": {{"include_names": true}},
            "workspace_name": "{WORKSPACE_NAME}"
        }}
    }}"""

    online_feature_data = requests.request(
        method="POST",
        headers=headers,
        url=f"https://{ACCOUNT_NAME}.tecton.ai/api/v1/feature-service/get-features",
        data=request_data,
    )

    online_feature_data_json = json.loads(online_feature_data.text)

    return online_feature_data_json

Now we can use our function to retrieve features at low latency!

user_id = "user_502567604689"

feature_data = get_online_feature_data(user_id)

if "result" not in feature_data:
    print("Feature data is not materialized")
else:
    print(feature_data["result"])

{'features': [None, 14.64, 12.296666666666667, None, '2', '3']}

💡 Create a function to make a prediction given feature data

Now that we can fetch feature data online, let's create a function that takes a feature vector and runs model inference to get a fraud prediction.

info

Typically you'd instead use a model serving API that is hosting your model. Here we run inference directly in our notebook for simplicity.

import pandas as pd


def get_prediction_from_model(feature_data):
    columns = [f["name"].replace(".", "__") for f in feature_data["metadata"]["features"]]
    data = [feature_data["result"]["features"]]

    features = pd.DataFrame(data, columns=columns)

    return model.predict(features)[0]

✨ Run inference using features from Tecton

Let's put it all together and run inference!

We can fetch our online features from Tecton, call our inference function, and get a prediction.

user_id = "user_502567604689"

online_feature_data = get_online_feature_data(user_id)
prediction = get_prediction_from_model(online_feature_data)

print(prediction)

🔥 Create a function to evaluate a user transaction and accept or reject it

Our final step is to use our new fraud prediction pipeline to make decisions and take action in our application.

In the function below we use simple business logic to decide whether to accept or reject a transaction based on our predicted fraud score.

def evaluate_transaction(user_id):
    online_feature_data = get_online_feature_data(user_id)
    is_predicted_fraud = get_prediction_from_model(online_feature_data)

    if is_predicted_fraud == 0:
        return "Transaction accepted."
    else:
        return "Transaction denied."

💰 Evaluate a transaction

Put it all together and we have a single online, low-latency decision API for our application. Try it out below!

evaluate_transaction("user_502567604689")

Transaction accepted.

⭐️ Conclusion

In this tutorial, we were able to quickly make an end to end real-time fraud detection application using features built in Tecton.

We tested our features, built training data sets, productionized features with engineering best practices, retrieved features online, and made decisions in real time!

But Tecton can do so much more:

streaming features
real-time features
monitoring
unit testing
cataloging and discovery
access controls
cost management
rules engines

...and more.

Next, we recommend checking out our tutorial on building streaming features to learn more about how to infuse your models with real-time data using nothing more than Python!

📚 Tecton Quickstart Tutorial

🔎 Examine raw data​

👩‍💻 Define and test features locally​

🧪 Test features interactively​

🧮 Generate training data​

🧠 Train a model​

🚀 Apply your Tecton application to production​

1. Create a Tecton Feature Repository​

2. Fill in features.py and enable materialization​

3. Apply your changes to a new workspace​

🟢 Check on backfilling status​

⚡️ Create a function to retrieve features from Tecton's REST API​

💡 Create a function to make a prediction given feature data​

✨ Run inference using features from Tecton​

🔥 Create a function to evaluate a user transaction and accept or reject it​

💰 Evaluate a transaction​

⭐️ Conclusion​

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