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torch_ddp_feature_extractor.py
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torch_ddp_feature_extractor.py
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#!/usr/bin/env python
import sys
import os
import cv2
import models
import skimage.transform
import json
import numpy as np
import torch.nn as nn
from PIL import Image
import torch
from torchvision import transforms
from torch.utils.data import Dataset, DataLoader
import torch.distributed as dist
import torch.multiprocessing as mp
from torch.utils.data.distributed import DistributedSampler
from torch.nn.parallel import DistributedDataParallel as DDP
class YFCC100m(Dataset):
def __init__(self, image_dir, path, transform=None):
self.transform = transform
self.image = image_dir
self.metadata = self.read_json(path)["images"]
def read_json(self, path):
with open(path, 'rb') as file:
data=json.load(file)
file.close()
return data
def __len__(self):
return len(self.metadata)
def __getitem__(self, index):
try:
indices = np.array([index]).astype("int")
image_hash = self.metadata[index]["id"]
image_path = "../" + self.metadata[index]["file_path"]
image = Image.open(image_path).convert("RGB")
transform_image = self.transform(image).unsqueeze(0)
except Exception as exp:
print(exp)
return None
return indices, transform_image
class MyCollate:
def __call__(self, batch):
batch = list(filter(lambda x: x is not None, batch))
idx, att_feats = zip(*batch)
indices = np.stack(idx, axis=0).reshape(-1)
image_feats = torch.stack(att_feats, 0) # [B, 3, 384, 384]
return indices, image_feats
def fetch_hashes(index, fn):
f = index.tolist()
g = []
for i in f:
name = fn.metadata[i]["id"]
g.append(name)
return g
class ImageFeatures(nn.Module):
def __init__(self, layer_num):
super(ImageFeatures, self).__init__()
model = torch.hub.load('facebookresearch/WSL-Images', "resnext101_32x48d_wsl")
self.ig_resnext = torch.nn.Sequential(*list(model.children())[:layer_num])
def forward(self, img):
img = img.to("cuda")
with torch.no_grad():
x = self.ig_resnext(img)
return x
def feature_extractor_ddp(rank, world_size):
os.environ["MASTER_ADDR"] = "localhost"
os.environ["MASTER_PORT"] = "12355"
torch.cuda.set_device(rank)
# create default process group
dist.init_process_group("nccl", init_method="env://", rank=rank, world_size=world_size)
group = dist.new_group(list(range(world_size)))
cuda_device = rank
batch_size = 2
num_workers = 8
world_size = dist.get_world_size()
train_transform = transforms.Compose([transforms.Resize((256)),
transforms.CenterCrop(224),
transforms.ToTensor(),
transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225))])
dataset = YFCC100m(image_dir="../ParlAI/images/train_images",
path="data/personcap_added1.json",
transform=train_transform)
train_sampler = DistributedSampler(dataset=dataset, num_replicas=world_size, rank=rank)
train_loader = DataLoader(dataset=dataset,
batch_size=batch_size,
collate_fn=MyCollate(),
shuffle=False,
pin_memory=True,
sampler=train_sampler,
num_workers=num_workers)
mean_feats = ImageFeatures(-1).to(cuda_device)
spatial_feats = ImageFeatures(-2).to(cuda_device)
mean_model = DDP(mean_feats, device_ids=[rank], output_device=rank, broadcast_buffers=False)
spatial_model = DDP(spatial_feats, device_ids=[rank], output_device=rank, broadcast_buffers=False)
for i, (idx, img) in enumerate(train_loader):
img = img.to(cuda_device, non_blocking=True)
ofc_feats, oatt_feats = mean_model(img), spatial_model(img)
images_hashes = fetch_hashes(idx, dataset)
fc_feats = ofc_feats.detach().cpu().numpy()
att_feats = oatt_feats.detach().cpu().numpy()
for i, hashes in enumerate(images_hashes):
with open(f"data/yfcc_images/resnext101_32x48d_wsl/{hashes}.npy", "wb") as f:
np.save(f, fc_feats[i])
with open(f"data/yfcc_images/resnext101_32x48d_wsl_spatial_att/{hashes}.npy", "wb") as f:
np.save(f, att_feats[i])
print_freq = 5000
if rank == 0 and i % print_freq == 0: # print only for rank 0
print(f"Completed Inference on batch {i} for GPU 0")
if rank == 1 and i % print_freq == 0: # print only for rank 1
print(f"Completed Inference on batch {i} for GPU 1")
if rank == 2 and i % print_freq == 0: # print only for rank 2
print(f"Completed Inference on batch {i} for GPU 2")
if rank == 3 and i % print_freq == 0: # print only for rank 3
print(f"Completed Inference on batch {i} for GPU 3")
def run_ddp(demo_fn, world_size):
mp.spawn(demo_fn, args=(world_size, ), nprocs=world_size, join=True)
# dist.destroy_process_group()
if __name__ == "__main__":
world_size = 4 # number of gpus to parallize over
run_ddp(feature_extractor_ddp, world_size)