imageMulticlassClassification.py

class ImageMulticlassClassification:
    def __init__(self, imgWidth=300, imgHeight=300, batchSize=32):
        from time import time
        import tensorflow as tf
        import matplotlib.pyplot as plt
        import pathlib
        import datetime
        from sklearn.metrics import roc_curve, auc, roc_auc_score
        import os
        import keras
        import numpy as np
        import pandas as pd
        import tarfile
        import sklearn

        self.time = time
        self.sklearn = sklearn
        self.tf = tf
        self.plt = plt
        self.pathlib = pathlib
        self.datetime = datetime
        self.roc_curve = roc_curve
        self.roc_auc_score = roc_auc_score
        self.auc = auc
        self.os = os
        self.keras = keras
        self.np = np
        self.AUTOTUNE = tf.data.AUTOTUNE
        self.pd = pd
        self.tarfile = tarfile

        self.imgWidth = imgWidth
        self.imgHeight = imgHeight
        self.numGPU = len(self.tf.config.list_physical_devices('GPU'))
        if self.numGPU > 0:
            self.batchSize = batchSize * self.numGPU
        else:
            self.batchSize = batchSize
        self.Model = None
        self.time_callback = None
        self.history = None
        self.confusionMatrix = None
        self.validation_label = None
        self.trainDataset = None
        self.validationDataset = None
        self.accuracy = None
        self.recall = None
        self.precision = None
        self.f1Score = None
        self.modelName = ""

    
    def data_MakeDataset(self, datasetUrl=None, datasetPath=None, datasetDirectoryName="Dataset Covid19 Training", ratioValidation=0.2):
        """
        Purpose:
            - Make dataset from parameter
        
        Parameter:
            - datasetUrl: url of dataset
                - type: string
                - example: "https://storage.googleapis.com/fdataset/Dataset%20Covid19%20Training.tgz"
            - datasetPath: path of dataset
                - type: string
                - example: "C:/Users/User/Desktop/Dataset Covid19 Training.tgz"
            - datasetDirectoryName: name of dataset directory
                - type: string
                - example: "Dataset Covid19 Training"
            - ratioValidation: ratio of validation data
                - type: float
                - example: 0.2
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            if datasetUrl is not None:
                dataset_url = datasetUrl
                data_dir = self.tf.keras.utils.get_file(datasetDirectoryName, origin=dataset_url, untar=True)
                data_dir = self.pathlib.Path(data_dir)
            elif datasetPath is not None:
                currentPath = self.os.getcwd()
                if self.os.path.exists(currentPath + "/" + datasetDirectoryName):
                    # remove dataset directory with all file inside
                    self.os.system("rm -rf " + currentPath + "/" + datasetDirectoryName)
                # extract dataset
                my_tar = self.tarfile.open(datasetPath)
                # check if dataset directory exist then delete it
                my_tar.extractall(currentPath) # specify which folder to extract to
                my_tar.close()
                data_dir = self.pathlib.Path(f'{currentPath}/{datasetDirectoryName}/')

            image_count = len(list(data_dir.glob('*/*.jpg')))

            train_ds = self.tf.keras.preprocessing.image_dataset_from_directory(
            data_dir,
            seed=123,
            subset="training",
            validation_split=ratioValidation,
            image_size=(self.imgWidth, self.imgHeight),
            batch_size=self.batchSize)

            val_ds = self.tf.keras.preprocessing.image_dataset_from_directory(
            data_dir,
            seed=123,
            subset="validation",
            validation_split=ratioValidation,
            image_size=(self.imgWidth, self.imgHeight),
            batch_size=self.batchSize)

            self.trainDataset = train_ds.cache().shuffle(1000).prefetch(buffer_size=self.AUTOTUNE)
            self.validationDataset = val_ds.cache().prefetch(buffer_size=self.AUTOTUNE)
        
            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
            
    def data_PreprocessingDataset(self, typeRandomFlip="horizontal_and_vertical", RandomRotation=0.3, RandomZoom=0.2, shuffleTrainDataset=True, augmentTrainDataset=True):
        """
        Purpose:
            - Preprocessing dataset
        
        Parameter:
            - typeRandomFlip: type of random flip
                - type: string
                - example: "horizontal_and_vertical"
                - options: "horizontal", "vertical", "horizontal_and_vertical"
            - RandomRotation: random rotation
                - type: float
                - example: 0.3
            - RandomZoom: random zoom
                - type: float
                - example: 0.2
            - shuffleTrainDataset: shuffle train dataset
                - type: bool
                - example: True
            - augmentTrainDataset: augment train dataset
                - type: bool
                - example: True
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            rescale = self.tf.keras.layers.Rescaling(1.0 / 255, input_shape=(self.imgWidth, self.imgHeight, 3))

            data_augmentation = self.tf.keras.Sequential(
                [
                    self.tf.keras.layers.RandomFlip(typeRandomFlip, input_shape=(self.imgWidth,self.imgHeight,3)),
                    self.tf.keras.layers.RandomRotation(RandomRotation),
                    self.tf.keras.layers.RandomZoom(RandomZoom),
                ]
            )


            def prepare(ds, shuffle=False, augment=False):
                # Rescale dataset
                ds = ds.map(lambda x, y: (rescale(x), y), num_parallel_calls=self.AUTOTUNE)

                if shuffle:
                    ds = ds.shuffle(1024)

                # Use data augmentation only on the training set
                if augment:
                    ds = ds.map(lambda x, y: (data_augmentation(x), y), num_parallel_calls=self.AUTOTUNE,)

                # Use buffered prefecting
                return ds.prefetch(buffer_size=self.AUTOTUNE)

            self.trainDataset = prepare(self.trainDataset, shuffle=shuffleTrainDataset, augment=augmentTrainDataset)
            self.validationDataset = prepare(self.validationDataset)
            
            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def data_GetLabelFromDataset(self, dataset):
        """
        Purpose:
            - Get label from dataset
        
        Parameter:
            - dataset: dataset
                - type: tf.data.Dataset
                - example: trainDataset
        
        Return:
            - {"success":True, "code":200, "detail":"success", "label":array([0, 0, 0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0,
       0, 0, 1, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1,
       1, 0, 0, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0,
       1, 1, 0, 0, 0, 0, 0, 0], dtype=int32)}
        """
        try:
            label = self.np.concatenate([y for x, y in dataset], axis=0)
            return {"success":True, "code":200, "detail":"success", "label":label}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def model_make(self, model=None):
        """
        Purpose:
            - Make default model
        
        Parameter:
            - model: model
                - type: tf.keras.Model
                - example: model
                - default: None
        
        Return:
            - {"success":True, "code":200, "detail":"success", "model":model}
        """
        try:
            if model is None:
                model = self.tf.keras.Sequential()
                base_model = self.tf.keras.applications.DenseNet121(include_top=False, input_shape=(self.imgWidth, self.imgHeight, 3))
                base_model.trainable=True
                model.add(base_model)
                model.add(self.tf.keras.layers.Dropout(0.4))
                model.add(self.tf.keras.layers.Flatten())
                model.add(self.tf.keras.layers.Dense(128,activation='relu'))
                model.add(self.tf.keras.layers.Dropout(0.5))
                model.add(self.tf.keras.layers.Dense(32,activation='relu'))
                model.add(self.tf.keras.layers.Dense(1, activation="sigmoid"))
                self.Model = model
            else:
                self.Model = model
            return {"success":True, "code":200, "detail":"success", "model":self.Model}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def training_model(self, epochs=10, lossFunction="binary_crossentropy", optimizer="adam", metrics=["accuracy"], device='/GPU:0', modelName=None):
        """
        Purpose:
            - Training model
        
        Parameter:
            - model: model
                - type: tf.keras.Model
                - example: model
                - default: True
            - epochs: epochs
                - type: int
                - example: 10
            - lossFunction: loss function
                - type: string
                - example: "binary_crossentropy"
                - options: "binary_crossentropy", "categorical_crossentropy", "sparse_categorical_crossentropy"
            - optimizer: optimizer
                - type: string
                - example: "adam"
                - options: "adam", "adamax", "nadam", "rmsprop", "sgd", tf.keras.optimizers.RMSprop(learning_rate=1e-4)
            - metrics: metrics
                - type: list
                - example: ["accuracy"]
            - device: device
                - type: string
                - example: "/GPU:0"
                - options: "/CPU:0", "/GPU:0"
            - modelName: model name
                - type: string
                - example: "model"
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            if modelName is not None:
                self.modelName = modelName

            self.time_callback = TimeHistory()
            self.Model.compile(
                loss=lossFunction,
                optimizer=optimizer,
                metrics=metrics,
            )

            print(self.Model.summary())

            with self.tf.device(device):
                self.history = self.Model.fit(
                    self.trainDataset, validation_data=self.validationDataset, epochs=epochs, verbose=1, callbacks=[self.time_callback]
                )
            # make excel file report.xlsx and save data in column 1 is number of training loss, column 2 is training accuracy, column 3 is validation loss, column 4 is validation accuracy, column 5 is training time
            dataFrameHistory = self.pd.DataFrame({"training_loss":self.history.history["loss"], "training_accuracy":self.history.history["accuracy"], "validation_loss":self.history.history["val_loss"], "validation_accuracy":self.history.history["val_accuracy"], "training_time":self.time_callback.times})
            dataFrameHistory.to_excel(f"report_{self.modelName}.xlsx")

            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def training_model_multiGPU(self, epochs=10, lossFunction="binary_crossentropy", optimizer="adam", metrics=["accuracy"], device='/GPU:0', modelName=None):
        """
        Purpose:
            - Training model with multi GPU support, with mirrored strategy
        
        Parameter:
            - model: model
                - type: tf.keras.Model
                - example: model
                - default: True
            - epochs: epochs
                - type: int
                - example: 10
            - lossFunction: loss function
                - type: string
                - example: "binary_crossentropy"
                - options: "binary_crossentropy", "categorical_crossentropy", "sparse_categorical_crossentropy"
            - optimizer: optimizer
                - type: string
                - example: "adam"
                - options: "adam", "adamax", "nadam", "rmsprop", "sgd", tf.keras.optimizers.RMSprop(learning_rate=1e-4)
            - metrics: metrics
                - type: list
                - example: ["accuracy"]
            - device: device
                - type: string
                - example: "/GPU:0"
                - options: "/CPU:0", "/GPU:0"
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            if modelName is not None:
                self.modelName = modelName

            self.time_callback = TimeHistory()

            print(self.Model.summary())
            strategy = self.tf.distribute.MirroredStrategy()
            with strategy.scope():
                model = self.Model
            model.compile(loss=lossFunction, optimizer=optimizer, metrics=metrics)

            self.history = model.fit(self.trainDataset, validation_data=self.validationDataset, epochs=epochs, verbose=1, callbacks=[self.time_callback])
            # make excel file report.xlsx and save data in column 1 is number of training loss, column 2 is training accuracy, column 3 is validation loss, column 4 is validation accuracy, column 5 is training time
            dataFrameHistory = self.pd.DataFrame({"training_loss":self.history.history["loss"], "training_accuracy":self.history.history["accuracy"], "validation_loss":self.history.history["val_loss"], "validation_accuracy":self.history.history["val_accuracy"], "training_time":self.time_callback.times})
            dataFrameHistory.to_excel(f"report_{self.modelName}.xlsx")

            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}

    def evaluation(self, labelName=["COVID19", "NORMAL"]):
        """
        Purpose:
            - Evaluation model with confusionMatrix, precision, recall, f1Score, accuracy
        
        Parameter:
            - labelName: label name
                - type: list
                - example: ["COVID19", "NORMAL"]
        
        Return:
            - {"success":True, "code":200, "detail":"success", "confusionMatrix":confusionMatrix, "precision":precision, "recall":recall, "f1Score":f1Score, "accuracy":accuracy}
        """
        try:
            self.Model.evaluate(self.validationDataset)
            # get prediction result as label
            prediction_result = self.Model.predict(self.validationDataset)
            prediction_result = self.np.argmax(prediction_result, axis=1)
            self.validation_label = self.np.concatenate([y for x, y in self.validationDataset], axis=0)
            # make confusion matrix for multi class using tensorflow
            self.confusionMatrix = self.tf.math.confusion_matrix(labels=self.validation_label, predictions=prediction_result).numpy()
            # get accuracy, precision, recall, f1Score for multi class
            self.accuracy = self.sklearn.metrics.accuracy_score(self.validation_label, prediction_result)
            self.precision = self.sklearn.metrics.precision_score(self.validation_label, prediction_result, average="macro")
            self.recall = self.sklearn.metrics.recall_score(self.validation_label, prediction_result, average="macro")
            self.f1Score = self.sklearn.metrics.f1_score(self.validation_label, prediction_result, average="macro")
            self.__drawConfusionMatrix(labelName)
            self.__drawROC()
            # save accuracy, recall, precision, f1Score in excel file which name is reportScore_.xlsx
            dataFrameScore = self.pd.DataFrame({"accuracy":[self.accuracy], "recall":[self.recall], "precision":[self.precision], "f1Score":[self.f1Score]})
            dataFrameScore.to_excel(f"reportScore_{self.modelName}.xlsx")
            # draw history accuracy with training and validation dataset
            self.__drawHistoryAccuracy()
            # draw history loss with training and validation dataset
            self.__drawHistoryLoss()
            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def __drawConfusionMatrix(self, labelName=["COVID19", "NORMAL"]):
        # draw confusion matrix with numeric value on the center and library matplotlib with label of validation dataset like this sample https://scikit-learn.org/stable/_images/sklearn-metrics-plot_confusion_matrix-1.png
        labelName.sort()
        fig, ax = self.plt.subplots()
        im = ax.imshow(self.confusionMatrix)
        ax.figure.colorbar(im, ax=ax)
        ax.set(xticks=self.np.arange(self.confusionMatrix.shape[1]), yticks=self.np.arange(self.confusionMatrix.shape[0]), xticklabels=labelName, yticklabels=labelName, title="Confusion Matrix", ylabel="True label", xlabel="Predicted label")
        ax.set_xlabel("Predicted")
        ax.set_ylabel("True")
        self.plt.setp(ax.get_xticklabels(), rotation=45, ha="right", rotation_mode="anchor")
        for i in range(self.confusionMatrix.shape[0]):
            for j in range(self.confusionMatrix.shape[1]):
                ax.text(j, i, self.confusionMatrix[i, j], ha="center", va="center", color="w")
        self.plt.tight_layout()
        self.plt.savefig(f"confusionMatrix_{self.modelName}.png")
        self.plt.show()
        self.plt.close()
        # save confusion matrix to excel file
        dataFrameConfusionMatrix = self.pd.DataFrame(self.confusionMatrix)
        dataFrameConfusionMatrix.to_excel(f"confusionMatrix_{self.modelName}.xlsx")
    
    def __drawROC(self):
        """
        Purpose:
            - Draw ROC curve like this sample https://scikit-learn.org/stable/_images/sphx_glr_plot_roc_001.png for multi class
        """
        predictResult = self.Model.predict(self.validationDataset)
        fpr, tpr, thresholds = self.sklearn.metrics.roc_curve(self.validation_label, predictResult[:, 1], pos_label=1)
        self.auc = self.sklearn.metrics.auc(fpr, tpr)
        fig, ax = self.plt.subplots()
        ax.plot(fpr, tpr, label="ROC curve (area = %0.2f)" % self.auc)
        ax.plot([0, 1], [0, 1], "k--")
        ax.set_xlim([0.0, 1.0])
        ax.set_ylim([0.0, 1.05])
        ax.set_xlabel("False Positive Rate")
        ax.set_ylabel("True Positive Rate")
        ax.set_title("Receiver operating characteristic")
        ax.legend(loc="best")
        self.plt.savefig(f"ROC_{self.modelName}.png")
        self.plt.show()
        self.plt.close()
        # save ROC curve to excel file
        dataFrameROC = self.pd.DataFrame({"fpr":fpr, "tpr":tpr, "thresholds":thresholds, "auc":self.auc})
        dataFrameROC.to_excel(f"ROC_{self.modelName}.xlsx")
    
    def __drawHistoryAccuracy(self):
        """
        Purpose:
            - Draw history accuracy with training and validation dataset
        """
        fig, ax = self.plt.subplots()
        ax.plot(self.history.history["accuracy"], label="training dataset")
        ax.plot(self.history.history["val_accuracy"], label="validation dataset")
        ax.set_xlabel("Epoch")
        ax.set_ylabel("Accuracy")
        ax.set_title("Accuracy")
        ax.legend(loc="best")
        self.plt.savefig(f"historyAccuracy_{self.modelName}.png")
        self.plt.show()
        self.plt.close()
    
    def __drawHistoryLoss(self):
        """
        Purpose:
            - Draw history loss with training and validation dataset
        """
        fig, ax = self.plt.subplots()
        ax.plot(self.history.history["loss"], label="training dataset")
        ax.plot(self.history.history["val_loss"], label="validation dataset")
        ax.set_xlabel("Epoch")
        ax.set_ylabel("Loss")
        ax.set_title("Loss")
        ax.legend(loc="best")
        self.plt.savefig(f"historyLoss_{self.modelName}.png")
        self.plt.show()
        self.plt.close()

    def import_data_Dataset(self, trainDataset, validationDataset):
        """
        Purpose:
            - Import dataset
        
        Parameter:
            - trainDataset: dataset
                - type: tf.data.Dataset
                - example: trainDataset
            - validationDataset: dataset
                - type: tf.data.Dataset
                - example: validationDataset
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            self.trainDataset = trainDataset
            self.validationDataset = validationDataset
            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def saveModelWithWeight(self, fileName):
        """
        Purpose:
            - Save model with weight
        
        Parameter:
            - fileName: file name
                - type: string
                - example: "my_model"
                - options: "my_model", "gs://bucket/my_model"
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            self.Model.save(fileName)
            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}
    
    def loadModelWithWeightAndCustomObject(self, fileName, customObject):
        """
        Purpose:
            - Load model with weight and custom object
        
        Parameter:
            - fileName: file name
                - type: string
                - example: "my_model"
                - options: "my_model", "gs://bucket/my_model"
            - customObject: custom object
                - type: dict
                - example: {"MyCustomObject":MyCustomObject}
        
        Return:
            - {"success":True, "code":200, "detail":"success"}
        """
        try:
            self.Model = self.tf.keras.models.load_model(fileName, custom_objects=customObject)
            return {"success":True, "code":200, "detail":"success"}
        except Exception as e:
            return {"success":False, "code":500, "detail":str(e)}

import tensorflow as tf
from time import time
class TimeHistory(tf.keras.callbacks.Callback):
    def on_train_begin(self, logs={}):
        self.times = []

    def on_epoch_begin(self, batch, logs={}):
        self.epoch_time_start = time()

    def on_epoch_end(self, batch, logs={}):
        self.times.append(time() - self.epoch_time_start)