wandb/examples

Call .watch and pass in your PyTorch model to automatically log gradients and store the network topology. Next, use .log to track other metrics. The following example demonstrates an example of how to do this:

import wandb

# 1. Start a new run
run = wandb.init(project="gpt4")

# 2. Save model inputs and hyperparameters
config = run.config
config.dropout = 0.01

# 3. Log gradients and model parameters
run.watch(model)
for batch_idx, (data, target) in enumerate(train_loader):
    ...
    if batch_idx % args.log_interval == 0:
        # 4. Log metrics to visualize performance
        run.log({"loss": loss})

• Run an example Google Colab Notebook.
• Read the Developer Guide for technical details on how to integrate PyTorch with W&B.
• Explore W&B Reports.

The following code example demonstrates how your script might look like when you integrate W&B with Keras:

# This script needs these libraries to be installed:
#   tensorflow, numpy

import wandb
from wandb.keras import WandbMetricsLogger, WandbModelCheckpoint

import random
import numpy as np
import tensorflow as tf


# Start a run, tracking hyperparameters
run = wandb.init(
    # set the wandb project where this run will be logged
    project="my-awesome-project",
    # track hyperparameters and run metadata with wandb.config
    config={
        "layer_1": 512,
        "activation_1": "relu",
        "dropout": random.uniform(0.01, 0.80),
        "layer_2": 10,
        "activation_2": "softmax",
        "optimizer": "sgd",
        "loss": "sparse_categorical_crossentropy",
        "metric": "accuracy",
        "epoch": 8,
        "batch_size": 256,
    },
)

# [optional] use wandb.config as your config
config = run.config

# get the data
mnist = tf.keras.datasets.mnist
(x_train, y_train), (x_test, y_test) = mnist.load_data()
x_train, x_test = x_train / 255.0, x_test / 255.0
x_train, y_train = x_train[::5], y_train[::5]
x_test, y_test = x_test[::20], y_test[::20]
labels = [str(digit) for digit in range(np.max(y_train) + 1)]

# build a model
model = tf.keras.models.Sequential(
    [
        tf.keras.layers.Flatten(input_shape=(28, 28)),
        tf.keras.layers.Dense(config.layer_1, activation=config.activation_1),
        tf.keras.layers.Dropout(config.dropout),
        tf.keras.layers.Dense(config.layer_2, activation=config.activation_2),
    ]
)

# compile the model
model.compile(optimizer=config.optimizer, loss=config.loss, metrics=[config.metric])

# WandbMetricsLogger will log train and validation metrics to wandb
# WandbModelCheckpoint will upload model checkpoints to wandb
history = model.fit(
    x=x_train,
    y=y_train,
    epochs=config.epoch,
    batch_size=config.batch_size,
    validation_data=(x_test, y_test),
    callbacks=[
        WandbMetricsLogger(log_freq=5),
        WandbModelCheckpoint("models"),
    ],
)

# [optional] finish the wandb run, necessary in notebooks
run.finish()

Get started integrating your Keras model with W&B today:

• Run an example Google Colab Notebook
• Read the Developer Guide for technical details on how to integrate Keras with W&B.
• Explore W&B Reports.

Pass wandb to the report_to argument when you run a script using a HuggingFace Trainer. W&B will automatically log losses, evaluation metrics, model topology, and gradients.

Note: The environment you run your script in must have wandb installed.

The following example demonstrates how to integrate W&B with Hugging Face:

# This script needs these libraries to be installed:
#   numpy, transformers, datasets

import wandb

import os
import numpy as np
from datasets import load_dataset
from transformers import TrainingArguments, Trainer
from transformers import AutoTokenizer, AutoModelForSequenceClassification


def tokenize_function(examples):
    return tokenizer(examples["text"], padding="max_length", truncation=True)


def compute_metrics(eval_pred):
    logits, labels = eval_pred
    predictions = np.argmax(logits, axis=-1)
    return {"accuracy": np.mean(predictions == labels)}


# download prepare the data
dataset = load_dataset("yelp_review_full")
tokenizer = AutoTokenizer.from_pretrained("distilbert-base-uncased")

small_train_dataset = dataset["train"].shuffle(seed=42).select(range(1000))
small_eval_dataset = dataset["test"].shuffle(seed=42).select(range(300))

small_train_dataset = small_train_dataset.map(tokenize_function, batched=True)
small_eval_dataset = small_eval_dataset.map(tokenize_function, batched=True)

# download the model
model = AutoModelForSequenceClassification.from_pretrained(
    "distilbert-base-uncased", num_labels=5
)

# set the wandb project where this run will be logged
os.environ["WANDB_PROJECT"] = "my-awesome-project"

# save your trained model checkpoint to wandb
os.environ["WANDB_LOG_MODEL"] = "true"

# turn off watch to log faster
os.environ["WANDB_WATCH"] = "false"

# pass "wandb" to the `report_to` parameter to turn on wandb logging
training_args = TrainingArguments(
    output_dir="models",
    report_to="wandb",
    logging_steps=5,
    per_device_train_batch_size=32,
    per_device_eval_batch_size=32,
    evaluation_strategy="steps",
    eval_steps=20,
    max_steps=100,
    save_steps=100,
)

# define the trainer and start training
trainer = Trainer(
    model=model,
    args=training_args,
    train_dataset=small_train_dataset,
    eval_dataset=small_eval_dataset,
    compute_metrics=compute_metrics,
)
trainer.train()

# [optional] finish the wandb run, necessary in notebooks
wandb.finish()

• Run an example Google Colab Notebook.
• Read the Developer Guide for technical details on how to integrate Hugging Face with W&B.

Build scalable, structured, high-performance PyTorch models with Lightning and log them with W&B.

# This script needs these libraries to be installed:
#   torch, torchvision, pytorch_lightning

import wandb

import os
from torch import optim, nn, utils
from torchvision.datasets import MNIST
from torchvision.transforms import ToTensor

import pytorch_lightning as pl
from pytorch_lightning.loggers import WandbLogger


class LitAutoEncoder(pl.LightningModule):
    def __init__(self, lr=1e-3, inp_size=28, optimizer="Adam"):
        super().__init__()

        self.encoder = nn.Sequential(
            nn.Linear(inp_size * inp_size, 64), nn.ReLU(), nn.Linear(64, 3)
        )
        self.decoder = nn.Sequential(
            nn.Linear(3, 64), nn.ReLU(), nn.Linear(64, inp_size * inp_size)
        )
        self.lr = lr

        # save hyperparameters to self.hparamsm auto-logged by wandb
        self.save_hyperparameters()

    def training_step(self, batch, batch_idx):
        x, y = batch
        x = x.view(x.size(0), -1)
        z = self.encoder(x)
        x_hat = self.decoder(z)
        loss = nn.functional.mse_loss(x_hat, x)

        # log metrics to wandb
        self.log("train_loss", loss)
        return loss

    def configure_optimizers(self):
        optimizer = optim.Adam(self.parameters(), lr=self.lr)
        return optimizer


# init the autoencoder
autoencoder = LitAutoEncoder(lr=1e-3, inp_size=28)

# setup data
batch_size = 32
dataset = MNIST(os.getcwd(), download=True, transform=ToTensor())
train_loader = utils.data.DataLoader(dataset, shuffle=True)

# initialise the wandb logger and name your wandb project
wandb_logger = WandbLogger(project="my-awesome-project")

# add your batch size to the wandb config
wandb_logger.experiment.config["batch_size"] = batch_size

# pass wandb_logger to the Trainer
trainer = pl.Trainer(limit_train_batches=750, max_epochs=5, logger=wandb_logger)

# train the model
trainer.fit(model=autoencoder, train_dataloaders=train_loader)

# [optional] finish the wandb run, necessary in notebooks
wandb.finish()

• Run an example Google Colab Notebook.
• Read the Developer Guide for technical details on how to integrate PyTorch Lightning with W&B.

The following code example demonstrates how your script might look like when you integrate W&B with XGBoost:

# This script needs these libraries to be installed:
#   numpy, xgboost

import wandb
from wandb.xgboost import WandbCallback

import numpy as np
import xgboost as xgb


# setup parameters for xgboost
param = {
    "objective": "multi:softmax",
    "eta": 0.1,
    "max_depth": 6,
    "nthread": 4,
    "num_class": 6,
}

# start a new wandb run to track this script
run = wandb.init(
    # set the wandb project where this run will be logged
    project="my-awesome-project",
    # track hyperparameters and run metadata
    config=param,
)

# download data from wandb Artifacts and prep data
run.use_artifact("wandb/intro/dermatology_data:v0", type="dataset").download(".")
data = np.loadtxt(
    "./dermatology.data",
    delimiter=",",
    converters={33: lambda x: int(x == "?"), 34: lambda x: int(x) - 1},
)
sz = data.shape

train = data[: int(sz[0] * 0.7), :]
test = data[int(sz[0] * 0.7) :, :]

train_X = train[:, :33]
train_Y = train[:, 34]

test_X = test[:, :33]
test_Y = test[:, 34]

xg_train = xgb.DMatrix(train_X, label=train_Y)
xg_test = xgb.DMatrix(test_X, label=test_Y)
watchlist = [(xg_train, "train"), (xg_test, "test")]

# add another config to the wandb run
num_round = 5
run.config["num_round"] = 5
run.config["data_shape"] = sz

# pass WandbCallback to the booster to log its configs and metrics
bst = xgb.train(
    param, xg_train, num_round, evals=watchlist, callbacks=[WandbCallback()]
)

# get prediction
pred = bst.predict(xg_test)
error_rate = np.sum(pred != test_Y) / test_Y.shape[0]

# log your test metric to wandb
run.summary["Error Rate"] = error_rate

# [optional] finish the wandb run, necessary in notebooks
run.finish()

• Run an example Google Colab Notebook.
• Read the Developer Guide for technical details on how to integrate XGBoost with W&B.

# This script needs these libraries to be installed:
#   numpy, sklearn

import wandb
from wandb.sklearn import plot_precision_recall, plot_feature_importances
from wandb.sklearn import plot_class_proportions, plot_learning_curve, plot_roc

import numpy as np
from sklearn import datasets
from sklearn.ensemble import RandomForestClassifier
from sklearn.model_selection import train_test_split


# load and process data
wbcd = datasets.load_breast_cancer()
feature_names = wbcd.feature_names
labels = wbcd.target_names

test_size = 0.2
X_train, X_test, y_train, y_test = train_test_split(
    wbcd.data, wbcd.target, test_size=test_size
)

# train model
model = RandomForestClassifier()
model.fit(X_train, y_train)
model_params = model.get_params()

# get predictions
y_pred = model.predict(X_test)
y_probas = model.predict_proba(X_test)
importances = model.feature_importances_
indices = np.argsort(importances)[::-1]

# start a new wandb run and add your model hyperparameters
run = wandb.init(project="my-awesome-project", config=model_params)

# Add additional configs to wandb
run.config.update(
    {
        "test_size": test_size,
        "train_len": len(X_train),
        "test_len": len(X_test),
    }
)

# log additional visualisations to wandb
plot_class_proportions(y_train, y_test, labels)
plot_learning_curve(model, X_train, y_train)
plot_roc(y_test, y_probas, labels)
plot_precision_recall(y_test, y_probas, labels)
plot_feature_importances(model)

# [optional] finish the wandb run, necessary in notebooks
run.finish()

• Run an example Google Colab Notebook.
• Read the Developer Guide for technical details on how to integrate Scikit-Learn with W&B.