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import cv2
import torch
import onnx
import onnxruntime
import numpy as np
from tqdm import tqdm
# https://github.com/yahoo/open_nsfw
class NSFWChecker:
def __init__(self, model_path=None, providers=["CPUExecutionProvider"]):
model = onnx.load(model_path)
self.input_name = model.graph.input[0].name
session_options = onnxruntime.SessionOptions()
self.session = onnxruntime.InferenceSession(model_path, sess_options=session_options, providers=providers)
def is_nsfw(self, img_paths, threshold = 0.85):
skip_step = 1
total_len = len(img_paths)
if total_len < 100: skip_step = 1
if total_len > 100 and total_len < 500: skip_step = 10
if total_len > 500 and total_len < 1000: skip_step = 20
if total_len > 1000 and total_len < 10000: skip_step = 50
if total_len > 10000: skip_step = 100
for idx in tqdm(range(0, total_len, skip_step), total=int(total_len // skip_step), desc="Checking for NSFW contents"):
img = cv2.imread(img_paths[idx])
img = cv2.resize(img, (224,224)).astype('float32')
img -= np.array([104, 117, 123], dtype=np.float32)
img = np.expand_dims(img, axis=0)
score = self.session.run(None, {self.input_name:img})[0][0][1]
if score > threshold:
print(f"Detected nsfw score:{score}")
return True
return False
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