Image anomaly detection using Variational Autoencoder Part 2 (Shiojiri ML Mokumokukai # 7)
We would like to detect anomalies using VAE and the original data set by referring to the code of the site at the above URL.

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AttributeError Traceback (most recent call last)<ipython-input-15-3088cb233051>in<module>    2 if y_train [i] == 1: # 7 for sneakers
      3 temp = x_train [i,:,:,:]
---->4 x_train_b.append (temp.reshape ((x_train_shape [1],],

x_train_shape [2],

x_train_shape [3]))))
      Five 
      6 x_train_b = np.array (x_train_b)
AttributeError:'numpy.ndarray' object has no attribute'append'

I get the above error in the middle of the code and I don't know how to improve the code.

code

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from keras.layers import Lambda, Input, Dense, Reshape
from keras.models import Model
from keras.losses import mse
from keras.utils import plot_model
from keras import backend as K
from keras.layers import BatchNormalization, Activation, Flatten
from keras.layers.convolutional import Conv2DTranspose, Conv2D
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.colors as colors
import os
from sklearn import metrics
os.chdir ('/ Users/user_name/desktop/VAE')
os.getcwd ()
def result_score (model, x, name, height = 80, width = 80, move = 2):
    score = []
    for k in range (len (x)):
        max_score = -1000000000if k% 100 == 0:
          print (k)
        for i in range (int ((x.shape [1] -height)/move) +1):
            for j in range (int ((x.shape [2] -width)/move) +1):
                x_sub = x [k, i * move: i * move + height, j * move: j * move + width, 0]
                x_sub = x_sub.reshape (1, height, width, 1)
                #Conventional method
                if name == "old_":
                    #Score
                    temp_score = model.evaluate (x_sub, batch_size = 1, verbose = 0)
                    if temp_score>max_score:
                        max_score = temp_score
                #Proposed method
                else: else:
                    #Score
                    mu, sigma = model.predict (x_sub, batch_size = 1, verbose = 0)
                    loss = 0
                    for o in range (height):
                        for l in range (width):
                            loss + = 0.5 * (x_sub [0, o, l, 0] --mu [0, o, l, 0]) ** 2/sigma [0, o, l, 0]
                    if loss>max_score:
                       max_score = loss
        score.append (max_score)
    return (score)
def cut_img (x, number, height = 224, width = 224):
    print ("cutting images ...")
    x_out = []
    x_shape = x.shape
    for i in range (number):
        shape_0 = np.random.randint (0, x_shape [0])
        shape_1 = np.random.randint (0, x_shape [1]-height)
        shape_2 = np.random.randint (0, x_shape [2]-width)
        temp = x [shape_0, shape_1: shape_1 + height, shape_2: shape_2 + width, 0]
        x_out.append (temp.reshape ((height, width, x_shape [3])))
    print ("Complete.")
    x_out = np.array (x_out)
    return x_out
# reparameterization trick
# instead of sampling from Q (z | X), sample eps = N (0, I)
# z = z_mean + sqrt (var) * eps
def sampling (args):z_mean, z_log_var = args
    batch = K.shape (z_mean) [0]
    dim = K.int_shape (z_mean) [1]
    # by default, random_normal has mean = 0 and std = 1.0
    epsilon = K.random_normal (shape = (batch, dim))
    return z_mean + K.exp (0.5 * z_log_var) * epsilon
# dataset
from bcn_dataset import BCN_Dataset2
(x_train, y_train), (x_test, y_test) = BCN_Dataset2.create_bcn ()
x_train = x_train.reshape (x_train.shape [0],

 224, 224, 3)
x_test = x_test.reshape (x_test.shape [0],

 224, 224, 3)
x_train = x_train.astype ('float32')/255
x_test = x_test.astype ('float32')/255
x_train_b = []
x_test_b = []
x_test_n = []
x_train_shape = x_train.shape
for i in range (len (x_train)):
  if y_train [i] == 1: # 7 for sneakers
    temp = x_train [i,:,:,:]
    x_train_b.append (temp.reshape ((x_train_shape [1],],

x_train_shape [2],

x_train_shape [3]))))
x_train_b = np.array (x_train_b)
x_train_b = cut_img (x_train_b, 50)
print ("train data:", len (x_train_b))

What i am trying

1.About the error of'numpy.ndarray' object has no attribute'append'
2.Handling of np.array and list when setting feature data Error when visualizing decision tree'numpy.ndarray' object has no attribute'colum

Currently, there is a person who is asking a question with an error message similar to the above URL, and I am trying to decipher the meaning of the code and the answer as to whether I can solve my problem somehow, but how do I use my code? I'm holding my head because I don't know if I should improve it. I would appreciate any advice or advice.

Supplement

My PC is macOS Catalina version 10.15.5
Python version is 3.6.5
I'm using a Jupiter Notebook