Delete app.py
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app.py
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import cv2
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import numpy as np
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from PIL import Image
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import streamlit as st
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import tensorflow as tf
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from tensorflow.keras.models import load_model
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# most of this code has been obtained from Datature's prediction script
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# https://github.com/datature/resources/blob/main/scripts/bounding_box/prediction.py
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st.set_option('deprecation.showfileUploaderEncoding', False)
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@st.cache(allow_output_mutation=True)
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def load_model():
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return tf.saved_model.load('./saved_model')
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def load_label_map(label_map_path):
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"""
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Reads label map in the format of .pbtxt and parse into dictionary
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Args:
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label_map_path: the file path to the label_map
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Returns:
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dictionary with the format of {label_index: {'id': label_index, 'name': label_name}}
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"""
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label_map = {}
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with open(label_map_path, "r") as label_file:
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for line in label_file:
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if "id" in line:
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label_index = int(line.split(":")[-1])
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label_name = next(label_file).split(":")[-1].strip().strip('"')
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label_map[label_index] = {"id": label_index, "name": label_name}
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return label_map
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def predict_class(image, model):
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image = tf.cast(image, tf.float32)
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image = tf.image.resize(image, [150, 150])
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image = np.expand_dims(image, axis = 0)
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return model.predict(image)
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def plot_boxes_on_img(color_map, classes, bboxes, image_origi, origi_shape):
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for idx, each_bbox in enumerate(bboxes):
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color = color_map[classes[idx]]
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## Draw bounding box
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cv2.rectangle(
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image_origi,
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(int(each_bbox[1] * origi_shape[1]),
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int(each_bbox[0] * origi_shape[0]),),
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(int(each_bbox[3] * origi_shape[1]),
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int(each_bbox[2] * origi_shape[0]),),
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color,
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2,
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)
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## Draw label background
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cv2.rectangle(
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image_origi,
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(int(each_bbox[1] * origi_shape[1]),
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int(each_bbox[2] * origi_shape[0]),),
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(int(each_bbox[3] * origi_shape[1]),
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int(each_bbox[2] * origi_shape[0] + 15),),
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color,
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-1,
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)
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## Insert label class & score
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cv2.putText(
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image_origi,
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"Class: {}, Score: {}".format(
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str(category_index[classes[idx]]["name"]),
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str(round(scores[idx], 2)),
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),
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(int(each_bbox[1] * origi_shape[1]),
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int(each_bbox[2] * origi_shape[0] + 10),),
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cv2.FONT_HERSHEY_SIMPLEX,
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0.3,
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(0, 0, 0),
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1,
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cv2.LINE_AA,
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)
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return image_origi
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# Webpage code starts here
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#TODO change this
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st.title('YOUR PROJECT NAME')
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st.text('made by XXX')
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st.markdown('## Description about your project')
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with st.spinner('Model is being loaded...'):
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model = load_model()
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# ask user to upload an image
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file = st.file_uploader("Upload image", type=["jpg", "png"])
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if file is None:
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st.text('Waiting for upload...')
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else:
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st.text('Running inference...')
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# open image
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test_image = Image.open(file).convert("RGB")
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origi_shape = np.asarray(test_image).shape
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# resize image to default shape
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default_shape = 320
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image_resized = np.array(test_image.resize((default_shape, default_shape)))
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## Load color map
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category_index = load_label_map("./label_map.pbtxt")
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# TODO Add more colors if there are more classes
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# color of each label. check label_map.pbtxt to check the index for each class
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color_map = {
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1: [255, 0, 0], # bad -> red
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2: [0, 255, 0] # good -> green
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}
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## The model input needs to be a tensor
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input_tensor = tf.convert_to_tensor(image_resized)
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## The model expects a batch of images, so add an axis with `tf.newaxis`.
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input_tensor = input_tensor[tf.newaxis, ...]
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## Feed image into model and obtain output
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detections_output = model(input_tensor)
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num_detections = int(detections_output.pop("num_detections"))
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detections = {key: value[0, :num_detections].numpy() for key, value in detections_output.items()}
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detections["num_detections"] = num_detections
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## Filter out predictions below threshold
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# if threshold is higher, there will be fewer predictions
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# TODO change this number to see how the predictions change
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confidence_threshold = 0.8
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indexes = np.where(detections["detection_scores"] > confidence_threshold)
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## Extract predicted bounding boxes
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bboxes = detections["detection_boxes"][indexes]
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# there are no predicted boxes
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if len(bboxes) == 0:
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st.error('No boxes predicted')
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# there are predicted boxes
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else:
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st.success('Boxes predicted')
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classes = detections["detection_classes"][indexes].astype(np.int64)
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scores = detections["detection_scores"][indexes]
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# plot boxes and labels on image
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image_origi = np.array(Image.fromarray(image_resized).resize((origi_shape[1], origi_shape[0])))
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image_origi = plot_boxes_on_img(color_map, classes, bboxes, image_origi, origi_shape)
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# show image in web page
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st.image(Image.fromarray(image_origi), caption="Image with predictions", width=400)
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st.markdown("### Predicted boxes")
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for idx in range(len((bboxes))):
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st.markdown(f"* Class: {str(category_index[classes[idx]]['name'])}, confidence score: {str(round(scores[idx], 2))}")
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