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View imports.py
# You may need to restart your runtime prior to this, to let your installation take effect
import detectron2
from detectron2.utils.logger import setup_logger
setup_logger()
# import some common libraries
import numpy as np
import cv2
import random
from google.colab.patches import cv2_imshow
View evaluation.py
#import the COCO Evaluator to use the COCO Metrics
from detectron2.evaluation import COCOEvaluator, inference_on_dataset
from detectron2.data import build_detection_test_loader
#Call the COCO Evaluator function and pass the Validation Dataset
evaluator = COCOEvaluator("boardetect_val", cfg, False, output_dir="/output/")
val_loader = build_detection_test_loader(cfg, "boardetect_val")
#Use the created predicted model in the previous step
inference_on_dataset(predictor.model, val_loader, evaluator)
View predictions.py
from detectron2.utils.visualizer import ColorMode
#Use the final weights generated after successful training for inference
cfg.MODEL.WEIGHTS = os.path.join(cfg.OUTPUT_DIR, "model_final.pth")
cfg.MODEL.ROI_HEADS.SCORE_THRESH_TEST = 0.8 # set the testing threshold for this model
#Pass the validation dataset
cfg.DATASETS.TEST = ("boardetect_val", )
predictor = DefaultPredictor(cfg)
View set_config.py
from detectron2.engine import DefaultTrainer
from detectron2.config import get_cfg
import os
cfg = get_cfg()
cfg.merge_from_file(model_zoo.get_config_file("COCO-Detection/faster_rcnn_R_50_FPN_3x.yaml")) #Get the basic model configuration from the model zoo
#Passing the Train and Validation sets
cfg.DATASETS.TRAIN = ("boardetect_train",)
cfg.DATASETS.TEST = ("boardetect_val",)
# Number of data loading threads
cfg.DATALOADER.NUM_WORKERS = 4
View visualize.py
#Visualizing the Train Dataset
dataset_dicts = get_board_dicts("Text_Detection_Dataset_COCO_Format/train")
#Randomly choosing 3 images from the Set
for d in random.sample(dataset_dicts, 3):
img = cv2.imread(d["file_name"])
visualizer = Visualizer(img[:, :, ::-1], metadata=board_metadata)
vis = visualizer.draw_dataset_dict(d)
cv2_imshow(vis.get_image()[:, :, ::-1])
View get_board_dicts.py
import json
from detectron2.structures import BoxMode
def get_board_dicts(imgdir):
json_file = imgdir+"/dataset.json" #Fetch the json file
with open(json_file) as f:
dataset_dicts = json.load(f)
for i in dataset_dicts:
filename = i["file_name"]
i["file_name"] = imgdir+"/"+filename
for j in i["annotations"]:
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