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pytorch_training_e2e.py
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pytorch_training_e2e.py
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import click
import time
import json
import os
import tempfile
from typing import Dict
import numpy as np
from torchvision import transforms
from torchvision.models import resnet18
import torch
import torch.nn as nn
import torch.optim as optim
import ray
from ray import train
from ray.train import Checkpoint, RunConfig, ScalingConfig
from ray.train.torch import TorchTrainer
def add_fake_labels(batch: Dict[str, np.ndarray]) -> Dict[str, np.ndarray]:
batch_size = len(batch["image"])
batch["label"] = np.zeros([batch_size], dtype=int)
return batch
def transform_image(
batch: Dict[str, np.ndarray], transform: torch.nn.Module
) -> Dict[str, np.ndarray]:
transformed_tensors = [transform(image).numpy() for image in batch["image"]]
batch["image"] = transformed_tensors
return batch
def train_loop_per_worker(config):
raw_model = resnet18(pretrained=True)
model = train.torch.prepare_model(raw_model)
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(model.parameters(), lr=0.001, momentum=0.9)
train_dataset_shard = train.get_dataset_shard("train")
for epoch in range(config["num_epochs"]):
running_loss = 0.0
for i, data in enumerate(
train_dataset_shard.iter_torch_batches(batch_size=config["batch_size"])
):
# get the inputs; data is a list of [inputs, labels]
inputs = data["image"].to(device=train.torch.get_device())
labels = data["label"].to(device=train.torch.get_device())
# zero the parameter gradients
optimizer.zero_grad()
# forward + backward + optimize
outputs = model(inputs)
loss = criterion(outputs, labels)
loss.backward()
optimizer.step()
# print statistics
running_loss += loss.item()
if i % 2000 == 1999: # print every 2000 mini-batches
print(f"[{epoch + 1}, {i + 1:5d}] loss: {running_loss / 2000:.3f}")
running_loss = 0.0
with tempfile.TemporaryDirectory() as tmpdir:
torch.save(model.state_dict(), os.path.join(tmpdir, "model.pt"))
train.report(
dict(running_loss=running_loss),
checkpoint=Checkpoint.from_directory(tmpdir),
)
@click.command(help="Run Batch prediction on Pytorch ResNet models.")
@click.option("--data-size-gb", type=int, default=1)
@click.option("--num-epochs", type=int, default=2)
@click.option("--num-workers", type=int, default=1)
@click.option("--smoke-test", is_flag=True, default=False)
def main(data_size_gb: int, num_epochs=2, num_workers=1, smoke_test: bool = False):
data_url = (
f"s3://anonymous@air-example-data-2/{data_size_gb}G-image-data-synthetic-raw"
)
print(
"Running Pytorch image model training with "
f"{data_size_gb}GB data from {data_url}"
)
print(f"Training for {num_epochs} epochs with {num_workers} workers.")
start = time.time()
if smoke_test:
# Only read one image
data_url = [data_url + "/dog.jpg"]
print("Running smoke test on CPU with a single example")
else:
print(f"Running GPU training with {data_size_gb}GB data from {data_url}")
dataset = ray.data.read_images(data_url, size=(256, 256))
transform = transforms.Compose(
[
transforms.ToTensor(),
transforms.Resize(256),
transforms.CenterCrop(224),
transforms.Normalize(mean=[0.485, 0.456, 0.406], std=[0.229, 0.224, 0.225]),
]
)
dataset = dataset.map_batches(add_fake_labels)
dataset = dataset.map_batches(transform_image, fn_kwargs={"transform": transform})
trainer = TorchTrainer(
train_loop_per_worker=train_loop_per_worker,
train_loop_config={"batch_size": 64, "num_epochs": num_epochs},
datasets={"train": dataset},
scaling_config=ScalingConfig(
num_workers=num_workers, use_gpu=int(not smoke_test)
),
run_config=RunConfig(storage_path="/mnt/cluster_storage"),
)
trainer.fit()
total_time_s = round(time.time() - start, 2)
# For structured output integration with internal tooling
results = {"data_size_gb": data_size_gb, "num_epochs": num_epochs}
results["perf_metrics"] = [
{
"perf_metric_name": "total_time_s",
"perf_metric_value": total_time_s,
"perf_metric_type": "LATENCY",
},
{
"perf_metric_name": "throughout_MB_s",
"perf_metric_value": round(
num_epochs * data_size_gb * 1024 / total_time_s, 2
),
"perf_metric_type": "THROUGHPUT",
},
]
test_output_json = os.environ.get("TEST_OUTPUT_JSON", "/tmp/release_test_out.json")
with open(test_output_json, "wt") as f:
json.dump(results, f)
print(results)
if __name__ == "__main__":
main()