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Divers/tutoriel25-2/train_panneau.py

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+import tensorflow as tf
+from tensorflow.keras import layers, models
+import numpy as np
+from sklearn.utils import shuffle
+from sklearn.model_selection import train_test_split
+import cv2
+import os
+import time
+import common
+import dataset
+
+batch_size=128
+nbr_entrainement=20
+
+tab_images=np.array([]).reshape(0, common.size, common.size, 3)
+tab_labels=[]
+
+tab_panneau, tab_image_panneau=common.lire_images_panneaux(common.dir_images_panneaux, common.size)
+
+id=0
+for image in tab_image_panneau:
+    lot=dataset.create_lot_img(image, 12000)
+    tab_images=np.concatenate((tab_images, lot))
+    tab_labels=np.concatenate([tab_labels, np.full(len(lot), id)])
+    id+=1
+                
+tab_panneau=np.array(tab_panneau)
+tab_images=np.array(tab_images, dtype=np.float32)/255
+tab_labels=np.array(tab_labels, dtype=np.float32).reshape([-1, 1])
+
+train_images, test_images, train_labels, test_labels=train_test_split(tab_images, tab_labels, test_size=0.10)
+
+train_ds=tf.data.Dataset.from_tensor_slices((train_images, train_labels)).batch(batch_size)
+test_ds=tf.data.Dataset.from_tensor_slices((test_images, test_labels)).batch(batch_size)
+
+print("train_images", len(train_images))
+print("test_images", len(test_images))
+
+@tf.function
+def train_step(images, labels):
+  with tf.GradientTape() as tape:
+    predictions=model_panneau(images)
+    loss=loss_object(labels, predictions)
+  gradients=tape.gradient(loss, model_panneau.trainable_variables)
+  optimizer.apply_gradients(zip(gradients, model_panneau.trainable_variables))
+  train_loss(loss)
+  train_accuracy(labels, predictions)
+
+def train(train_ds, nbr_entrainement):
+  for entrainement in range(nbr_entrainement):
+    start=time.time()
+    for images, labels in train_ds:
+      train_step(images, labels)
+    message='Entrainement {:04d}: loss: {:6.4f}, accuracy: {:7.4f}%, temps: {:7.4f}'
+    print(message.format(entrainement+1,
+                         train_loss.result(),
+                         train_accuracy.result()*100,
+                         time.time()-start))
+    train_loss.reset_states()
+    train_accuracy.reset_states()
+    test(test_ds)
+    
+def test(test_ds):
+  start=time.time()
+  for test_images, test_labels in test_ds:
+    predictions=model_panneau(test_images)
+    t_loss=loss_object(test_labels, predictions)
+    test_loss(t_loss)
+    test_accuracy(test_labels, predictions)
+  message='   >>> Test: loss: {:6.4f}, accuracy: {:7.4f}%, temps: {:7.4f}'
+  print(message.format(test_loss.result(),
+                       test_accuracy.result()*100,
+                       time.time()-start))
+  test_loss.reset_states()
+  test_accuracy.reset_states()
+
+optimizer=tf.keras.optimizers.Adam()
+loss_object=tf.keras.losses.SparseCategoricalCrossentropy()
+train_loss=tf.keras.metrics.Mean()
+train_accuracy=tf.keras.metrics.SparseCategoricalAccuracy()
+test_loss=tf.keras.metrics.Mean()
+test_accuracy=tf.keras.metrics.SparseCategoricalAccuracy()
+model_panneau=common.panneau_model(len(tab_panneau))
+checkpoint=tf.train.Checkpoint(model_panneau=model_panneau)
+
+print("Entrainement")
+train(train_ds, nbr_entrainement)
+checkpoint.save(file_prefix="./training_panneau/panneau")
+
+for i in range(len(test_images)):
+    prediction=model_panneau(np.array([test_images[i]]))
+    print("prediction", prediction, tab_panneau[np.argmax(prediction[0])])
+    cv2.imshow("image", test_images[i])
+    if cv2.waitKey()&0xFF==ord('q'):
+        break