app.py

import os
from langchain.llms import OpenAI, OpenAIChat

os.system("pip install -U gradio")

import sys
import gradio as gr

os.system(
    "pip install detectron2 -f https://dl.fbaipublicfiles.com/detectron2/wheels/cu102/torch1.9/index.html"
)

# clone and install Detic
os.system(
    "git clone https://github.com/facebookresearch/Detic.git --recurse-submodules"
)
os.chdir("Detic")

# Install detectron2
import torch

# Some basic setup:
# Setup detectron2 logger
import detectron2
from detectron2.utils.logger import setup_logger

setup_logger()

# import some common libraries
import sys
import numpy as np
import os, json, cv2, random

# import some common detectron2 utilities
from detectron2 import model_zoo
from detectron2.engine import DefaultPredictor
from detectron2.config import get_cfg
from detectron2.utils.visualizer import Visualizer
from detectron2.data import MetadataCatalog, DatasetCatalog

# Detic libraries
sys.path.insert(0, "third_party/CenterNet2/projects/CenterNet2/")
sys.path.insert(0, "third_party/CenterNet2/")
from centernet.config import add_centernet_config
from detic.config import add_detic_config
from detic.modeling.utils import reset_cls_test

from PIL import Image

# Build the detector and download our pretrained weights
cfg = get_cfg()
add_centernet_config(cfg)
add_detic_config(cfg)
cfg.MODEL.DEVICE = "cpu"
cfg.merge_from_file("configs/Detic_LCOCOI21k_CLIP_SwinB_896b32_4x_ft4x_max-size.yaml")
cfg.MODEL.WEIGHTS = "https://dl.fbaipublicfiles.com/detic/Detic_LCOCOI21k_CLIP_SwinB_896b32_4x_ft4x_max-size.pth"
cfg.MODEL.ROI_HEADS.SCORE_THRESH_TEST = 0.5  # set threshold for this model
cfg.MODEL.ROI_BOX_HEAD.ZEROSHOT_WEIGHT_PATH = "rand"
cfg.MODEL.ROI_HEADS.ONE_CLASS_PER_PROPOSAL = (
    True  # For better visualization purpose. Set to False for all classes.
)
predictor = DefaultPredictor(cfg)

BUILDIN_CLASSIFIER = {
    "lvis": "datasets/metadata/lvis_v1_clip_a+cname.npy",
    "objects365": "datasets/metadata/o365_clip_a+cnamefix.npy",
    "openimages": "datasets/metadata/oid_clip_a+cname.npy",
    "coco": "datasets/metadata/coco_clip_a+cname.npy",
}

BUILDIN_METADATA_PATH = {
    "lvis": "lvis_v1_val",
    "objects365": "objects365_v2_val",
    "openimages": "oid_val_expanded",
    "coco": "coco_2017_val",
}

session_token = os.environ.get("SessionToken")


def generate_caption(object_list_str, api_key, temperature):
    query = f"You are an intelligent image captioner. I will hand you the objects and their position, and you should give me a detailed description for the photo. In this photo we have the following objects\n{object_list_str}"
    llm = OpenAIChat(
        model_name="gpt-3.5-turbo", openai_api_key=api_key, temperature=temperature
    )

    try:
        caption = llm(query)
        caption = caption.strip()
    except:
        caption = "Sorry, something went wrong!"

    return caption


def inference(img, vocabulary, api_key, temperature):
    metadata = MetadataCatalog.get(BUILDIN_METADATA_PATH[vocabulary])
    classifier = BUILDIN_CLASSIFIER[vocabulary]
    num_classes = len(metadata.thing_classes)
    reset_cls_test(predictor.model, classifier, num_classes)

    im = cv2.imread(img)

    outputs = predictor(im)
    v = Visualizer(im[:, :, ::-1], metadata)
    out = v.draw_instance_predictions(outputs["instances"].to("cpu"))

    detected_objects = []
    object_list_str = []

    box_locations = outputs["instances"].pred_boxes
    box_loc_screen = box_locations.tensor.cpu().numpy()

    for i, box_coord in enumerate(box_loc_screen):
        x0, y0, x1, y1 = box_coord
        width = x1 - x0
        height = y1 - y0
        predicted_label = metadata.thing_classes[outputs["instances"].pred_classes[i]]
        detected_objects.append(
            {
                "prediction": predicted_label,
                "x": int(x0),
                "y": int(y0),
                "w": int(width),
                "h": int(height),
            }
        )
        object_list_str.append(
            f"{predicted_label} - X:({int(x0)} Y: {int(y0)} Width {int(width)} Height: {int(height)})"
        )

    if api_key is not None:
        gpt_response = generate_caption(object_list_str, api_key, temperature)
    else:
        gpt_response = "Please paste your OpenAI key to use"

    return (
        Image.fromarray(np.uint8(out.get_image())).convert("RGB"),
        gpt_response,
    )


with gr.Blocks() as demo:
    with gr.Column():
        gr.Markdown("# Image Captioning using Detic and ChatGPT with LangChain 🦜️🔗")
        gr.Markdown(
            "Use Detic to detect objects in an image and then use `gpt-3.5-turbo` to describe the image."
        )

    with gr.Row():
        with gr.Column():
            inp = gr.Image(label="Input Image", type="filepath")
            with gr.Column():
                openai_api_key_textbox = gr.Textbox(
                    placeholder="Paste your OpenAI API key (sk-...)",
                    show_label=False,
                    lines=1,
                    type="password",
                )
                temperature = gr.Slider(0, 1, 0.1, label="Temperature")
                vocab = gr.Dropdown(
                    ["lvis", "objects365", "openimages", "coco"],
                    label="Detic Vocabulary",
                    value="lvis",
                )

            btn_detic = gr.Button("Run Detic and ChatGPT")
        with gr.Column():
            output_desc = gr.Textbox(label="Description Description", lines=5)
            outviz = gr.Image(label="Visualization", type="pil")

    btn_detic.click(
        fn=inference,
        inputs=[inp, vocab, openai_api_key_textbox, temperature],
        outputs=[outviz, output_desc],
    )


demo.launch(debug=False)