How to fit image data correctly to a model in python? Can someone tell me what i did wrong?

Question

so i am trying to trained a cnn model, but i really don't understand how to do it properly. i still learning about this kind of stuff so i'm really lost. I already tried doing stuff with it but still cannot get my head around it. can someone explain to me how to do it properly. when i try to fit the train data to the model this error pops up.

WARNING:tensorflow:Model was constructed with shape (None, 224, 224, 3) for input KerasTensor(type_spec=TensorSpec(shape=(None, 224, 224, 3), dtype=tf.float32, name='input_1'), name='input_1', description="created by layer 'input_1'"), but it was called on an input with incompatible shape (None,).
Traceback (most recent call last):
  File "G:/Skripsi/Program/training.py", line 80, in <module>
    train.train()
  File "G:/Skripsi/Program/training.py", line 70, in train
    model.fit(self.x_train, self.y_train, epochs=2, verbose=1)
  File "G:\Skripsi\Program\venv\lib\site-packages\keras\utils\traceback_utils.py", line 67, in error_handler
    raise e.with_traceback(filtered_tb) from None
  File "G:\Skripsi\Program\venv\lib\site-packages\tensorflow\python\framework\func_graph.py", line 1129, in autograph_handler
    raise e.ag_error_metadata.to_exception(e)
ValueError: in user code:
    File "G:\Skripsi\Program\venv\lib\site-packages\keras\engine\training.py", line 878, in train_function  *
        return step_function(self, iterator)
    File "G:\Skripsi\Program\venv\lib\site-packages\keras\engine\training.py", line 867, in step_function  **
        outputs = model.distribute_strategy.run(run_step, args=(data,))
    File "G:\Skripsi\Program\venv\lib\site-packages\keras\engine\training.py", line 860, in run_step  **
        outputs = model.train_step(data)
    File "G:\Skripsi\Program\venv\lib\site-packages\keras\engine\training.py", line 808, in train_step
        y_pred = self(x, training=True)
    File "G:\Skripsi\Program\venv\lib\site-packages\keras\utils\traceback_utils.py", line 67, in error_handler
        raise e.with_traceback(filtered_tb) from None
    File "G:\Skripsi\Program\venv\lib\site-packages\keras\engine\input_spec.py", line 227, in assert_input_compatibility
        raise ValueError(f'Input {input_index} of layer "{layer_name}" '
    ValueError: Exception encountered when calling layer "model" (type Functional).
        Input 0 of layer "conv2d" is incompatible with the layer: expected min_ndim=4, found ndim=1. Full shape received: (None,)
        Call arguments received:
      • inputs=tf.Tensor(shape=(None,), dtype=int32)
      • training=True
      • mask=None

this is my code for training the model.

from sklearn.model_selection import train_test_split
from tensorflow.keras.models import Model
from tensorflow.keras.layers import Input
from densenet201 import DenseNet201
import tensorflow as tf
import pandas as pd
import numpy as np
import cv2
import os

dataset_folder = "./datasets/train_datasets"


class TrainingPreprocessing:

    @staticmethod
    def preprocessing_train(path):
        images = cv2.imread(path, 3)
        images_resize = cv2.resize(src=images, dsize=(224, 224), interpolation=cv2.INTER_LINEAR)
        images_normalize = cv2.normalize(images_resize, None, alpha=0, beta=1, norm_type=cv2.NORM_MINMAX,
                                         dtype=cv2.CV_32F)
        return images_normalize.reshape(224, 224, 3)


class Training:

    @staticmethod
    def load_data():
        """Loads and Preprocess dataset"""
        train_labels_encode = []
        train_labels = []
        train_data = []

        file_list = os.listdir(dataset_folder)
        for folder in file_list:
            file_list2 = os.listdir(str(dataset_folder) + '/' + str(folder))
            for images in file_list2:
                train_labels_encode.append(folder)
                train_labels.append(folder)
                train_data.append(np.array(TrainingPreprocessing.preprocessing_train(
                    str(dataset_folder) + '/' + str(folder) + '/' + str(images)
                )))

        labels = np.array(train_labels_decode)
        data = np.array(train_data)
        return labels, data

    def split_data(self):
        """Split the preprocessed dataset to train and test data"""
        x, y = self.load_data()
        self.x_train, self.x_test, self.y_train, self.y_test = train_test_split(x, y, test_size=0.20, random_state=0)
        print('Training data shape : ', self.x_train.shape, self.y_train.shape)

        print('Testing data shape : ', self.x_test.shape, self.y_test.shape)

    def train(self):
        """Compile dan fit DenseNet model"""
        input_shape = 224, 224, 3
        number_classes = 2
        model = DenseNet201.densenet(input_shape, number_classes)
        model.summary()

        model.compile(loss='binary_crossentropy', optimizer='Adam', metrics=["accuracy"])
        model.fit(self.x_train, self.y_train, epochs=2, verbose=1)
        model.save_weights('densenet201_best_model.h5', overwrite=True)

        loss, accuracy = model.evaluate(self.x_test, self.y_test)

        print("[INFO] accuracy: {:.2f}%".format(accuracy * 100))


train = Training()
train.split_data()
train.train()

and this is the code for the cnn network

from tensorflow.keras.layers import AveragePooling2D, GlobalAveragePooling2D, MaxPool2D
from tensorflow.keras.layers import Input, Conv2D, BatchNormalization, Dense
from tensorflow.keras.layers import ReLU, concatenate, Dropout
from tensorflow.keras.models import Model
import tensorflow.keras.layers as layers
import tensorflow.keras.backend as K
import tensorflow as tf


class DenseNet201:

    def densenet(image_shape, number_classes, growth_rate=32):

        def batch_relu_conv(x, growth_rate, kernel=1, strides=1):
            x = BatchNormalization()(x)
            x = ReLU()(x)
            x = Conv2D(growth_rate, kernel, strides=strides, padding='same', kernel_initializer="he_uniform")(x)
            return x

        def dense_block(x, repetition):
            for _ in range(repetition):
     

       y = batch_relu_conv(x, 4 * growth_rate)
            y = batch_relu_conv(y, growth_rate, 3)
            x = concatenate([y, x])
        return x

    def transition_layer(x):
        x = batch_relu_conv(x, K.int_shape(x)[-1] // 2)
        x = AveragePooling2D(2, strides=2, padding='same')(x)
        return x

    inputs = Input(image_shape)
    x = Conv2D(64, 7, strides=2, padding='same', kernel_initializer="he_uniform")(inputs)
    x = MaxPool2D(3, strides=2, padding='same')(x)
    for repetition in [6, 12, 48, 32]:
        d = dense_block(x, repetition)
        x = transition_layer(d)
    x = GlobalAveragePooling2D ()(d)

    output = Dense(number_classes, activation='softmax')(x)

    model = Model(inputs, output)
    return model

Thanks in advance for any help you can give!

Answer 1

What is the size of the input images?

At line inputs = Input(image_shape) --> does it have the same shape required by Model from TF?

The error states that the input shape is (None,), instead of (None,224,224,3) -> can you check how inputs are defined?