Predicting the traffic signs by building CNN model using Keras

Predicting-Traffic-Signs-using-CNN.py

import os
import pandas as pd
from scipy.misc import imread
import math
import numpy as np
import cv2
import keras
import seaborn as sns
from keras.layers import Dense, Dropout, Flatten, Input
from keras.layers import Conv2D, MaxPooling2D
from keras.layers import BatchNormalization
from keras.optimizers import Adam
from keras.models import Sequential

### LOADING DATASET
data_dir = os.path.abspath('~/GTSRB/Final_Training/Images')
os.path.exists(data_dir)

### Function to resize the images using open cv
def resize_cv(im):
    return cv2.resize(im, (64, 64), interpolation = cv2.INTER_LINEAR)

### Loading datset
list_images = []
output = []
for dir in os.listdir(data_dir):
    if dir == '.DS_Store' :
        continue
    
    inner_dir = os.path.join(data_dir, dir)
    csv_file = pd.read_csv(os.path.join(inner_dir,"GT-" + dir + '.csv'), sep=';')
    for row in csv_file.iterrows() :
        img_path = os.path.join(inner_dir, row[1].Filename)
        img = imread(img_path)
        img = img[row[1]['Roi.X1']:row[1]['Roi.X2'],row[1]['Roi.Y1']:row[1]['Roi.Y2'],:]
        img = resize_cv(img)
        list_images.append(img)
        output.append(row[1].ClassId)

 
### Plotting the dataset
fig = sns.distplot(output, kde=False, bins = 43, hist = True, hist_kws=dict(edgecolor="black", linewidth=2))
fig.set(title = "Traffic signs frequency graph",
        xlabel = "ClassId",
        ylabel = "Frequency")

input_array = np.stack(list_images)

train_y = keras.utils.np_utils.to_categorical(output)

### Randomizing the dataset
randomize = np.arange(len(input_array))
np.random.shuffle(randomize)
x = input_array[randomize]
y = train_y[randomize]

### Splitting the dataset in train, validation, test set
split_size = int(x.shape[0]*0.6)
train_x, val_x = x[:split_size], x[split_size:]
train1_y, val_y = y[:split_size], y[split_size:]

split_size = int(val_x.shape[0]*0.5)
val_x, test_x = val_x[:split_size], val_x[split_size:]
val_y, test_y = val_y[:split_size], val_y[split_size:]


### Building the model
hidden_num_units = 2048
hidden_num_units1 = 1024
hidden_num_units2 = 128
output_num_units = 43

epochs = 10
batch_size = 16
pool_size = (2, 2)
input_shape = Input(shape=(32, 32,3))

model = Sequential([

 Conv2D(16, (3, 3), activation='relu', input_shape=(64,64,3), padding='same'),
 BatchNormalization(),

 Conv2D(16, (3, 3), activation='relu', padding='same'),
 BatchNormalization(),
 MaxPooling2D(pool_size=pool_size),
 Dropout(0.2),
    
 Conv2D(32, (3, 3), activation='relu', padding='same'),
 BatchNormalization(),
    
 Conv2D(32, (3, 3), activation='relu', padding='same'),
 BatchNormalization(),
 MaxPooling2D(pool_size=pool_size),
 Dropout(0.2),
    
 Conv2D(64, (3, 3), activation='relu', padding='same'),
 BatchNormalization(),
    
 Conv2D(64, (3, 3), activation='relu', padding='same'),
 BatchNormalization(),
 MaxPooling2D(pool_size=pool_size),
 Dropout(0.2),

 Flatten(),

 Dense(units=hidden_num_units, activation='relu'),
 Dropout(0.3),
 Dense(units=hidden_num_units1, activation='relu'),
 Dropout(0.3),
 Dense(units=hidden_num_units2, activation='relu'),
 Dropout(0.3),
 Dense(units=output_num_units, input_dim=hidden_num_units, activation='softmax'),
])

model.compile(loss='categorical_crossentropy', optimizer=Adam(lr=1e-4), metrics=['accuracy'])

### Training the model
trained_model_conv = model.fit(train_x.reshape(-1,64,64,3), train1_y, epochs=epochs, batch_size=batch_size, validation_data=(val_x, val_y))                               

### Prdicting the class
pred = model.predict_classes(test_x)

### Evaluating the model
model.evaluate(test_x, test_y)

Traceback (most recent call last):
File "signdetect.py", line 27, in
for dir in os.listdir(data_dir):
OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: 'C:\Users\Vishal B\Anaconda3\x07nacondaproject\envs\lucky\Lib\site-packages\models\research\object_detection\GTSRB\Train'