app.py

import random
import numpy as np
import gradio as gr
from huggingface_hub import from_pretrained_fastai
from PIL import Image
from groundingdino.util.inference import load_model
from groundingdino.util.inference import predict as grounding_dino_predict
import groundingdino.datasets.transforms as T
import torch
from torchvision.ops import box_convert
from torchvision.transforms.functional import to_tensor
from torchvision.transforms import GaussianBlur


# Define a custom transform for Gaussian blur
def gaussian_blur(x, p=0.5, kernel_size_min=3, kernel_size_max=20, sigma_min=0.1, sigma_max=3):
    if x.ndim == 4:
        for i in range(x.shape[0]):
            if random.random() < p:
                kernel_size = random.randrange(kernel_size_min, kernel_size_max + 1, 2)
                sigma = random.uniform(sigma_min, sigma_max)
                x[i] = GaussianBlur(kernel_size=kernel_size, sigma=sigma)(x[i])
    return x

# Custom Label Function
def custom_label_func(fpath):
    # this directs the labels to be 2 levels up from the image folder
    label = fpath.parents[2].name
    return label

# this function only describes how much a singular value in al ist stands out.
# if all values in the lsit are high or low this is 1
# the smaller the proportiopn of number of disimilar vlaues are to other more similar values the lower this number
# the larger the gap between the dissimilar numbers and the simialr number the smaller this number
# only able to interpret probabilities or values between 0 and 1
# this function outputs an estimate an inverse of the classification confidence based on the probabilities of all the classes.
# the wedge threshold splits the data on a threshold with a magnitude of a positive int to force a ledge/peak in the data
def unkown_prob_calc(probs, wedge_threshold, wedge_magnitude=1, wedge='strict'):
    if wedge =='strict':
        increase_var = (1/(wedge_magnitude))
        decrease_var = (wedge_magnitude)
    if wedge =='dynamic': # this allows pointsthat are furhter from the threshold ot be moved less and points clsoer to be moved more
        increase_var = (1/(wedge_magnitude*((1-np.abs(probs-wedge_threshold)))))
        decrease_var = (wedge_magnitude*((1-np.abs(probs-wedge_threshold))))
    else:
        print("Error: use 'strict' (default) or 'dynamic' as options for the wedge parameter!")
    probs = np.where(probs>=wedge_threshold , probs**increase_var, probs)
    probs = np.where(probs<=wedge_threshold , probs**decrease_var, probs)
    diff_matrix = np.abs(probs[:, np.newaxis] - probs)
    diff_matrix_sum = np.sum(diff_matrix)
    probs_sum = np.sum(probs)
    class_val = (diff_matrix_sum/probs_sum)
    max_class_val = ((len(probs)-1)*2)
    kown_prob = class_val/max_class_val
    unknown_prob = 1-kown_prob
    return(unknown_prob)

def load_image(image_source):
    transform = T.Compose(
        [
            T.RandomResize([800], max_size=1333),
            T.ToTensor(),
            T.Normalize([0.485, 0.456, 0.406], [0.229, 0.224, 0.225]),
        ]
    )
    image_source = image_source.convert("RGB")
    
    image_transformed, _ = transform(image_source, None)
    return image_transformed

# load object detection model
od_model = load_model(
    model_checkpoint_path="groundingdino_swint_ogc.pth", 
    model_config_path="GroundingDINO_SwinT_OGC.cfg.py", 
    device="cpu")
print("Object detection model loaded")

def detect_objects(og_image, model=od_model, prompt="bug . insect", device="cpu"):
    TEXT_PROMPT = prompt
    BOX_TRESHOLD = 0.35
    TEXT_TRESHOLD = 0.25
    DEVICE = device  # cuda or cpu
    
    # Convert numpy array to PIL Image if needed
    if isinstance(og_image, np.ndarray):
        og_image_obj = Image.fromarray(og_image)
    else:
        og_image_obj = og_image  # Assuming og_image is already a PIL Image

    # Transform the image
    image_transformed = load_image(image_source = og_image_obj)
    
    # Your model prediction code here...
    boxes, logits, phrases = grounding_dino_predict(
        model=model,
        image=image_transformed,
        caption=TEXT_PROMPT,
        box_threshold=BOX_TRESHOLD,
        text_threshold=TEXT_TRESHOLD,
        device=DEVICE)

    # Use og_image_obj directly for further processing
    height, width = og_image_obj.size
    boxes_norm = boxes * torch.Tensor([height, width, height, width])
    xyxy = box_convert(
        boxes=boxes_norm,
        in_fmt="cxcywh",
        out_fmt="xyxy").numpy()
    img_lst = []
    for i in range(len(boxes_norm)):
        crop_img = og_image_obj.crop((xyxy[i]))
        img_lst.append(crop_img)
    return (img_lst)


# load beetle classifier model
repo_id="ChristopherMarais/beetle-model-mini"
bc_model = from_pretrained_fastai(repo_id)
# get class names
labels = np.append(np.array(bc_model.dls.vocab), "Unknown")
print("Classification model loaded")

def predict_beetle(img):
    # Split image into smaller images of detected objects
    image_lst = detect_objects(og_image=img, model=od_model, prompt="bug . insect", device="cpu")
    print("Objects detected")
    # get predictions for all segments
    conf_dict_lst = []
    output_lst = []
    img_cnt = len(image_lst)
    for i in range(0,img_cnt):
        prob_ar = np.array(bc_model.predict(image_lst[i])[2])
        print(f"Beetle classified - {i}")
        unkown_prob = unkown_prob_calc(probs=prob_ar, wedge_threshold=0.85, wedge_magnitude=5, wedge='dynamic')
        prob_ar = np.append(prob_ar, unkown_prob)
        prob_ar = np.around(prob_ar*100, decimals=1)
        # only show the top 5 predictions
        # Sorting the dictionary by value in descending order and taking the top items
        top_num = 3
        conf_dict = {labels[i]: float(prob_ar[i]) for i in range(len(prob_ar))}
        conf_dict = dict(sorted(conf_dict.items(), key=lambda item: item[1], reverse=True)[:top_num])
        conf_dict_lst.append(str(conf_dict)[1:-1]) # remove dictionary brackets
        result = list(zip(image_lst, conf_dict_lst))
        print(f"Classification processed - {i}")
    return(result)


# gradio app
css = """
button {
    width: auto;  /* Set your desired width */
}
"""

with gr.Blocks(css=css) as demo:
    with gr.Column(variant="panel"):
        with gr.Row(variant="compact"):
            inputs = gr.Image()
            # Use the `full_width` parameter directly
            btn = gr.Button("Classify")

        # Set the gallery layout and height directly in the constructor
        gallery = gr.Gallery(label="Show images", show_label=True, elem_id="gallery")
    btn.click(predict_beetle, inputs, gallery)
demo.launch(height="auto")