python - ValueError : Error when checking input: expected input_1 to have 4 dimensions, 但得到形状为 (6243, 256, 256) 的数组

Question

我想在训练数据集上附加标签，我这样做

def one_hot_label(img):
    label = img
    if label == 'A':
        ohl = np.array([1, 0])
    elif label == 'B':
        ohl = np.array([0, 1])
    return ohl

def train_data_with_label():
    train_images = []
    for i in tqdm(os.listdir(train_data)):
        path_pre = os.path.join(train_data, i)
        for img in os.listdir(path_pre):
            if img.endswith('.jpg'):
                path = os.path.join(path_pre, img)
                img = cv2.imread(path, cv2.IMREAD_GRAYSCALE)
                train_images.append([np.array(img), one_hot_label(i)])
    shuffle(train_images)
    return train_images

但是在Keras上执行输入时返回错误

training_images = train_data_with_label()
tr_img_data = np.array([i[0] for i in training_images])
tr_lbl_data = np.array([i[1] for i in training_images])

model = Sequential()
model.add(InputLayer(input_shape=(256, 256, 1)))

谁能帮我解决这个问题吗？

Answer 1

您的输入层需要一个形状为 (batch_size, 256, 256, 1) 的数组，但看起来您正在传递形状为 (batch_size, 256, 256) 的数据。您可以尝试按如下方式 reshape 训练数据:

tr_img_data = np.expand_dims(tr_img_data, axis=-1)