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Scalable data processing for ML workloads. Streaming execution across CPU/GPU, supports Parquet/CSV/JSON/images. Integrates with Ray Train, PyTorch, TensorFlow. Scales from single machine to 100s of n
The skill file stays in the publisher's repository.
Paste the copied command in a terminal. It installs this SKILL.md into that agent.
npx skills add Orchestra-Research/AI-Research-SKILLs --skill ray-data -a cursor -y
Scalable data processing for ML workloads. Streaming execution across CPU/GPU, supports Parquet/CSV/JSON/images. Integrates with Ray Train, PyTorch, TensorFlow. Scales from single machine to 100s of nodes. Use for batch inference, data preprocessing, multi-modal data loading, or distributed ETL pipelines.
Scalable data processing for ML workloads. Streaming execution across CPU/GPU, supports Parquet/CSV/JSON/images. Integrates with Ray Train, PyTorch, TensorFlow. Scales from single machine to 100s of nodes. Use for batch inference, data preprocessing, multi-modal data loading, or distributed ETL pipelines.
Distributed data processing library for ML and AI workloads.
Use Ray Data when:
Key features:
Use alternatives instead:
pip install -U 'ray[data]'
import ray
# Read Parquet files
ds = ray.data.read_parquet("s3://bucket/data/*.parquet")
# Transform data (lazy execution)
ds = ds.map_batches(lambda batch: {"processed": batch["text"].str.lower()})
# Consume data
for batch in ds.iter_batches(batch_size=100):
print(batch)
import ray
from ray.train import ScalingConfig
from ray.train.torch import TorchTrainer
# Create dataset
train_ds = ray.data.read_parquet("s3://bucket/train/*.parquet")
def train_func(config):
# Access dataset in training
train_ds = ray.train.get_dataset_shard("train")
for epoch in range(10):
for batch in train_ds.iter_batches(batch_size=32):
# Train on batch
pass
# Train with Ray
trainer = TorchTrainer(
train_func,
datasets={"train": train_ds},
scaling_config=ScalingConfig(num_workers=4, use_gpu=True)
)
trainer.fit()
import ray
# Parquet (recommended for ML)
ds = ray.data.read_parquet("s3://bucket/data/*.parquet")
# CSV
ds = ray.data.read_csv("s3://bucket/data/*.csv")
# JSON
ds = ray.data.read_json("gs://bucket/data/*.json")
# Images
ds = ray.data.read_images("s3://bucket/images/")
# From list
ds = ray.data.from_items([{"id": i, "value": i * 2} for i in range(1000)])
# From range
ds = ray.data.range(1000000) # Synthetic data
# From pandas
import pandas as pd
df = pd.DataFrame({"col1": [1, 2, 3], "col2": [4, 5, 6]})
ds = ray.data.from_pandas(df)
# Batch transformation (fast)
def process_batch(batch):
batch["doubled"] = batch["value"] * 2
return batch
ds = ds.map_batches(process_batch, batch_size=1000)
# Row-by-row (slower)
def process_row(row):
row["squared"] = row["value"] ** 2
return row
ds = ds.map(process_row)
# Filter rows
ds = ds.filter(lambda row: row["value"] > 100)
# Group by column
ds = ds.groupby("category").count()
# Custom aggregation
ds = ds.groupby("category").map_groups(lambda group: {"sum": group["value"].sum()})
# Use GPU for preprocessing
def preprocess_images_gpu(batch):
import torch
images = torch.tensor(batch["image"]).cuda()
# GPU preprocessing
processed = images * 255
return {"processed": processed.cpu().numpy()}
ds = ds.map_batches(
preprocess_images_gpu,
batch_size=64,
num_gpus=1 # Request GPU
)
# Write to Parquet
ds.write_parquet("s3://bucket/output/")
# Write to CSV
ds.write_csv("output/")
# Write to JSON
ds.write_json("output/")
# Control parallelism
ds = ds.repartition(100) # 100 blocks for 100-core cluster
# Larger batches = faster vectorized ops
ds.map_batches(process_fn, batch_size=10000) # vs batch_size=100
# Process data larger than memory
ds = ray.data.read_parquet("s3://huge-dataset/")
for batch in ds.iter_batches(batch_size=1000):
process(batch) # Streamed, not loaded to memory
import ray
# Load model
def load_model():
# Load once per worker
return MyModel()
# Inference function
class BatchInference:
def __init__(self):
self.model = load_model()
def __call__(self, batch):
predictions = self.model(batch["input"])
return {"prediction": predictions}
# Run distributed inference
ds = ray.data.read_parquet("s3://data/")
predictions = ds.map_batches(BatchInference, batch_size=32, num_gpus=1)
predictions.write_parquet("s3://output/")
# Multi-step pipeline
ds = (
ray.data.read_parquet("s3://raw/")
.map_batches(clean_data)
.map_batches(tokenize)
.map_batches(augment)
.write_parquet("s3://processed/")
)
# Convert to PyTorch
torch_ds = ds.to_torch(label_column="label", batch_size=32)
for batch in torch_ds:
# batch is dict with tensors
inputs, labels = batch["features"], batch["label"]
# Convert to TensorFlow
tf_ds = ds.to_tf(feature_columns=["image"], label_column="label", batch_size=32)
for features, labels in tf_ds:
# Train model
pass
| Format | Read | Write | Use Case |
|---|---|---|---|
| Parquet | ✅ | ✅ | ML data (recommended) |
| CSV | ✅ | ✅ | Tabular data |
| JSON | ✅ | ✅ | Semi-structured |
| Images | ✅ | ❌ | Computer vision |
| NumPy | ✅ | ✅ | Arrays |
| Pandas | ✅ | ❌ | DataFrames |
Scaling (processing 100GB data):
GPU acceleration (image preprocessing):
Production deployments: