def flatten(t): return t.reshape(t.shape[0], -1)

时间: 2024-04-18 18:23:57 浏览: 10
这是一个函数定义,名为 `flatten`,它接受一个参数 `t`。函数的作用是将输入的数组 `t` 进行展平,返回一个二维数组。 在函数内部,使用了 `reshape` 方法对数组 `t` 进行重塑。`reshape` 方法用于改变数组的形状,其中 `-1` 表示自动计算该维度的大小。在这里,我们将第一个维度保持不变,将剩余的维度展平为一维。 最后,函数返回重塑后的数组。
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def flatten(t): return t.reshape(t.shape[0], -1)

这个函数是用来将多维数组展平为二维数组的。它使用了NumPy库的`reshape`方法来实现。函数接受一个多维数组`t`作为输入,并返回一个展平后的二维数组。 `t.shape[0]`表示多维数组`t`的第一个维度的大小,也就是行数。在`t.reshape(t.shape[0], -1)`中,第一个参数是行数,第二个参数`-1`表示根据行数自动计算列数。这样,原始数组的所有元素会按顺序放入展平后的二维数组中。 请注意,这个函数要求多维数组的维度数量保持不变,只是将其展平为二维数组。

def backward(self, dout): dout = dout.transpose(0, 2, 3, 1) pool_size = self.pool_h * self.pool_w dmax = np.zeros((dout.size, pool_size)) dmax[np.arange(self.arg_max.size), self.arg_max.flatten()] = dout.flatten() dmax = dmax.reshape(dout.shape + (pool_size,)) dcol = dmax.reshape(dmax.shape[0] * dmax.shape[1] * dmax.shape[2], -1) dx = col2im(dcol, self.x.shape, self.pool_h, self.pool_w, self.stride, self.pad) return dx

这段代码是池化层的反向传播函数实现。在前向传播中,我们已经得到了池化层的输出结果out和最大值的索引arg_max,现在需要根据输出结果和arg_max求出输入数据的梯度,即dout/dx。具体实现流程如下: 1. 将输出结果的维度转置为(N, out_h, out_w, C)。 2. 计算每个池化窗口内最大值的位置,根据arg_max和dout求出dmax,即每个最大值的梯度。 3. 将dmax重构为四维数组,形状为(N, C, out_h, out_w, pool_size)。 4. 将dmax转换为二维数组dcol,方便后续的矩阵计算。 5. 通过col2im函数将dcol转换为输入数据的梯度dx。 6. 返回dx。 以上就是该函数的具体实现流程。

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定义卷积神经网络实现宝石识别 # --------------------------------------------------------补充完成网络结构定义部分,实现宝石分类------------------------------------------------------------ class MyCNN(nn.Layer): def init(self): super(MyCNN,self).init() self.conv0=nn.Conv2D(in_channels=3, out_channels=64, kernel_size=3, stride=1) self.pool0=nn.MaxPool2D(kernel_size=2, stride=2) self.conv1=nn.Conv2D(in_channels=64, out_channels=128, kernel_size=4, stride=1) self.pool1=nn.MaxPool2D(kernel_size=2, stride=2) self.conv2=nn.Conv2D(in_channels=128, out_channels=50, kernel_size=5) self.pool2=nn.MaxPool2D(kernel_size=2, stride=2) self.conv3=nn.Conv2D(in_channels=50, out_channels=50, kernel_size=5) self.pool3=nn.MaxPool2D(kernel_size=2, stride=2) self.conv4=nn.Conv2D(in_channels=50, out_channels=50, kernel_size=5) self.pool4=nn.MaxPool2D(kernel_size=2, stride=2) self.fc1=nn.Linear(in_features=5033, out_features=25) def forward(self,input): print("input.shape:",input.shape) # 进行第一次卷积和池化操作 x=self.conv0(input) print("x.shape:",x.shape) x=self.pool0(x) print('x0.shape:',x.shape) # 进行第二次卷积和池化操作 x=self.conv1(x) print(x.shape) x=self.pool1(x) print('x1.shape:',x.shape) # 进行第三次卷积和池化操作 x=self.conv2(x) print(x.shape) x=self.pool2(x) print('x2.shape:',x.shape) # 进行第四次卷积和池化操作 x=self.conv3(x) print(x.shape) x=self.pool3(x) print('x3.shape:',x.shape) # 进行第五次卷积和池化操作 x=self.conv4(x) print(x.shape) x=self.pool4(x) print('x4.shape:',x.shape) # 将卷积层的输出展开成一维向量 x=paddle.reshape(x, shape=[-1, 5033]) print('x3.shape:',x.shape) # 进行全连接层操作 y=self.fc1(x) print('y.shape:', y.shape) return y改进代码

将这段代码转换为伪代码:def levenberg_marquardt(fun, grad, jacobian, x0, iterations, tol): """ Minimization of scalar function of one or more variables using the Levenberg-Marquardt algorithm. Parameters ---------- fun : function Objective function. grad : function Gradient function of objective function. jacobian :function function of objective function. x0 : numpy.array, size=9 Initial value of the parameters to be estimated. iterations : int Maximum iterations of optimization algorithms. tol : float Tolerance of optimization algorithms. Returns ------- xk : numpy.array, size=9 Parameters wstimated by optimization algorithms. fval : float Objective function value at xk. grad_val : float Gradient value of objective function at xk. grad_log : numpy.array The record of gradient of objective function of each iteration. """ fval = None # y的最小值 grad_val = None # 梯度的最后一次下降的值 x_log = [] # x的迭代值的数组,n*9,9个参数 y_log = [] # y的迭代值的数组,一维 grad_log = [] # 梯度下降的迭代值的数组 x0 = asarray(x0).flatten() if x0.ndim == 0: x0.shape = (1,) # iterations = len(x0) * 200 k = 1 xk = x0 updateJ = 1 lamda = 0.01 old_fval = fun(x0) gfk = grad(x0) gnorm = np.amax(np.abs(gfk)) J = [None] H = [None] while (gnorm > tol) and (k < iterations): if updateJ == 1: x_log = np.append(x_log, xk.T) yk = fun(xk) y_log = np.append(y_log, yk) J = jacobian(x0) H = np.dot(J.T, J) H_lm = H + (lamda * np.eye(9)) gfk = grad(xk) pk = - np.linalg.inv(H_lm).dot(gfk) pk = pk.A.reshape(1, -1)[0] # 二维变一维 xk1 = xk + pk fval = fun(xk1) if fval < old_fval: lamda = lamda / 10 xk = xk1 old_fval = fval updateJ = 1 else: updateJ = 0 lamda = lamda * 10 gnorm = np.amax(np.abs(gfk)) k = k + 1 grad_log = np.append(grad_log, np.linalg.norm(xk - x_log[-1:])) fval = old_fval grad_val = grad_log[-1] return xk, fval, grad_val, x_log, y_log, grad_log

import numpy as np import matplotlib.pyplot as plt from scipy import signal t = np.linspace(0, 2 * np.pi, 128, endpoint=False) x = np.sin(2 * t) print(x) kernel1 = np.array([[-1, 0, 1], [-2, 0, 2], [-1, 0, 1]]) kernel2 = np.array([[1, 2, 1], [0, 0, 0], [-1, -2, -1]]) result1 = signal.convolve2d(x.reshape(1, -1), kernel1, mode='same') result2 = signal.convolve2d(x.reshape(1, -1), kernel2, mode='same') fig, axs = plt.subplots(3, 1, figsize=(8, 8)) axs[0].plot(t, x) axs[0].set_title('Original signal') axs[1].imshow(kernel1) axs[1].set_title('Kernel 1') axs[2].imshow(kernel2) axs[2].set_title('Kernel 2') fig.tight_layout() fig, axs = plt.subplots(3, 1, figsize=(8, 8)) axs[0].plot(t, x) axs[0].set_title('Original signal') axs[1].plot(t, result1.flatten()) axs[1].set_title('Result of convolution with kernel 1') axs[2].plot(t, result2.flatten()) axs[2].set_title('Result of convolution with kernel 2') fig.tight_layout() plt.show() # from scipy.signal import pool import numpy as np def pool(signal, window_size, mode='max'): if mode == 'max': return np.max(signal.reshape(-1, window_size), axis=1) elif mode == 'min': return np.min(signal.reshape(-1, window_size), axis=1) elif mode == 'mean': return np.mean(signal.reshape(-1, window_size), axis=1) else: raise ValueError("Invalid mode. Please choose 'max', 'min', or 'mean'.") # 对卷积结果进行最大池化 pool_size = 2 result1_pooled = pool(result1, pool_size, 'max') result2_pooled = pool(result2, pool_size, 'max') # 可视化结果 fig, axs = plt.subplots(3, 1, figsize=(8, 8)) axs[0].plot(t, x) axs[0].set_title('Original signal') axs[1].plot(t, result1.flatten()) axs[1].set_title('Result of convolution with kernel 1') axs[2].plot(t[::2], result1_pooled.flatten()) axs[2].set_title('Result of max pooling after convolution with kernel 1') fig.tight_layout() plt.show()给这段代码添加全连接层,每一步公式结果都要出结果图

# GRADED FUNCTION: forward_propagation def forward_propagation(X, parameters): """ Implements the forward propagation for the model: CONV2D -> RELU -> MAXPOOL -> CONV2D -> RELU -> MAXPOOL -> FLATTEN -> FULLYCONNECTED Arguments: X -- input dataset placeholder, of shape (input size, number of examples) parameters -- python dictionary containing your parameters "W1", "W2" the shapes are given in initialize_parameters Returns: Z3 -- the output of the last LINEAR unit """ # Retrieve the parameters from the dictionary "parameters" W1 = parameters['W1'] W2 = parameters['W2'] ### START CODE HERE ### # CONV2D: stride of 1, padding 'SAME' Z1 = tf.nn.conv2d(X, W1, strides=[1, 1, 1, 1], padding='SAME') # RELU A1 = tf.nn.relu(Z1) # MAXPOOL: window 8x8, sride 8, padding 'SAME' P1 = tf.nn.max_pool(A1, ksize=[1, 8, 8, 1], strides=[1, 8, 8, 1], padding='SAME') # CONV2D: filters W2, stride 1, padding 'SAME' Z2 = tf.nn.conv2d(P1, W2, strides=[1, 1, 1, 1], padding='SAME') # RELU A2 = tf.nn.relu(Z2) # MAXPOOL: window 4x4, stride 4, padding 'SAME' P2 = tf.nn.max_pool(A2, ksize=[1, 4, 4, 1], strides=[1, 4, 4, 1], padding='SAME') # FLATTEN P2 = tf.contrib.layers.flatten(P2) # FULLY-CONNECTED without non-linear activation function (not not call softmax). # 6 neurons in output layer. Hint: one of the arguments should be "activation_fn=None" Z3 = tf.contrib.layers.fully_connected(P2, 6, activation_fn=None) ### END CODE HERE ### return Z3 tf.reset_default_graph() with tf.Session() as sess: np.random.seed(1) X, Y = create_placeholders(64, 64, 3, 6) parameters = initialize_parameters() Z3 = forward_propagation(X, parameters) init = tf.global_variables_initializer() sess.run(init) a = sess.run(Z3, {X: np.random.randn(2,64,64,3), Y: np.random.randn(2,6)}) print("Z3 = " + str(a)) 请根据现在python版本修改这段代码

X_train,T_train=idx2numpy.convert_from_file('emnist/emnist-letters-train-images-idx3-ubyte'),idx2numpy.convert_from_file('emnist/emnist-letters-train-labels-idx1-ubyte')转化为相同形式train_num = 60000 test_num = 10000 img_dim = (1, 28, 28) img_size = 784 def _download(file_name): file_path = dataset_dir + "/" + file_name if os.path.exists(file_path): return print("Downloading " + file_name + " ... ") urllib.request.urlretrieve(url_base + file_name, file_path) print("Done") def download_mnist(): for v in key_file.values(): _download(v) def _load_label(file_name): file_path = dataset_dir + "/" + file_name print("Converting " + file_name + " to NumPy Array ...") with gzip.open(file_path, 'rb') as f: labels = np.frombuffer(f.read(), np.uint8, offset=8) print("Done") return labels def _load_img(file_name): file_path = dataset_dir + "/" + file_name print("Converting " + file_name + " to NumPy Array ...") with gzip.open(file_path, 'rb') as f: data = np.frombuffer(f.read(), np.uint8, offset=16) data = data.reshape(-1, img_size) print("Done") return data def _convert_numpy(): dataset = {} dataset['train_img'] = _load_img(key_file['train_img']) dataset['train_label'] = _load_label(key_file['train_label']) dataset['test_img'] = _load_img(key_file['test_img']) dataset['test_label'] = _load_label(key_file['test_label']) return dataset def init_mnist(): download_mnist() dataset = _convert_numpy() print("Creating pickle file ...") with open(save_file, 'wb') as f: pickle.dump(dataset, f, -1) print("Done!") def _change_one_hot_label(X): T = np.zeros((X.size, 10)) for idx, row in enumerate(T): row[X[idx]] = 1 return T def load_mnist(normalize=True, flatten=True, one_hot_label=False): """读入MNIST数据集 Parameters ---------- normalize : 将图像的像素值正规化为0.0~1.0 one_hot_label : one_hot_label为True的情况下,标签作为one-hot数组返回 one-hot数组是指[0,0,1,0,0,0,0,0,0,0]这样的数组 flatten : 是否将图像展开为一维数组 Returns ------- (训练图像, 训练标签), (测试图像, 测试标签) """ if not os.path.exists(save_file): init_mnist() with open(save_file, 'rb') as f: dataset = pickle.load(f) if normalize: for key in ('train_img', 'test_img'): dataset[key] = dataset[key].astype(np.float32) dataset[key] /= 255.0 if one_hot_label: dataset['train_label'] = _change_one_hot_label(dataset['train_label']) dataset['test_label'] = _change_one_hot_label(dataset['test_label']) if not flatten: for key in ('train_img', 'test_img'): dataset[key] = dataset[key].reshape(-1, 1, 28, 28) return (dataset['train_img'], dataset['train_label']), (dataset['test_img'], dataset['test_label']) if name == 'main': init_mnist()模仿这段代码将获取同样形式

Create a model def create_LSTM_model(X_train,n_steps,n_length, n_features): # instantiate the model model = Sequential() model.add(Input(shape=(X_train.shape[1], X_train.shape[2]))) model.add(Reshape((n_steps, 1, n_length, n_features))) model.add(ConvLSTM2D(filters=64, kernel_size=(1,3), activation='relu', input_shape=(n_steps, 1, n_length, n_features))) model.add(Flatten()) # cnn1d Layers # 添加lstm层 model.add(LSTM(64, activation = 'relu', return_sequences=True)) model.add(Dropout(0.5)) #添加注意力层 model.add(LSTM(64, activation = 'relu', return_sequences=False)) # 添加dropout model.add(Dropout(0.5)) model.add(Dense(128)) # 输出层 model.add(Dense(1, name='Output')) # 编译模型 model.compile(optimizer='adam', loss='mse', metrics=['mae']) return model # lstm network model = create_LSTM_model(X_train,n_steps,n_length, n_features) # summary print(model.summary())修改该代码,解决ValueError Traceback (most recent call last) <ipython-input-56-6c1ed99fa3ed> in <module> 53 # lstm network 54 ---> 55 model = create_LSTM_model(X_train,n_steps,n_length, n_features) 56 # summary 57 print(model.summary()) <ipython-input-56-6c1ed99fa3ed> in create_LSTM_model(X_train, n_steps, n_length, n_features) 17 model = Sequential() 18 model.add(Input(shape=(X_train.shape[1], X_train.shape[2]))) ---> 19 model.add(Reshape((n_steps, 1, n_length, n_features))) 20 21 ~\anaconda3\lib\site-packages\tensorflow\python\trackable\base.py in _method_wrapper(self, *args, **kwargs) 203 self._self_setattr_tracking = False # pylint: disable=protected-access 204 try: --> 205 result = method(self, *args, **kwargs) 206 finally: 207 self._self_setattr_tracking = previous_value # pylint: disable=protected-access ~\anaconda3\lib\site-packages\keras\utils\traceback_utils.py in error_handler(*args, **kwargs) 68 # To get the full stack trace, call: 69 # tf.debugging.disable_traceback_filtering() ---> 70 raise e.with_traceback(filtered_tb) from None 71 finally: 72 del filtered_tb ~\anaconda3\lib\site-packages\keras\layers\reshaping\reshape.py in _fix_unknown_dimension(self, input_shape, output_shape) 116 output_shape[unknown] = original // known 117 elif original != known: --> 118 raise ValueError(msg) 119 return output_shape 120 ValueError: Exception encountered when calling layer "reshape_5" (type Reshape). total size of new array must be unchanged, input_shape = [10, 1], output_shape = [10, 1, 1, 5] Call arguments received by layer "reshape_5" (type Reshape): • inputs=tf.Tensor(shape=(None, 10, 1), dtype=float32)问题

import numpy as np import pandas as pd import matplotlib.pyplot as plt from sklearn.preprocessing import MinMaxScaler from keras.models import Sequential from keras.layers import Dense, LSTM from sklearn.metrics import r2_score,median_absolute_error,mean_absolute_error # 读取数据 data = pd.read_csv(r'C:/Users/Ljimmy/Desktop/yyqc/peijian/销量数据rnn.csv') # 取出特征参数 X = data.iloc[:,2:].values # 数据归一化 scaler = MinMaxScaler(feature_range=(0, 1)) X[:, 0] = scaler.fit_transform(X[:, 0].reshape(-1, 1)).flatten() #X = scaler.fit_transform(X) #scaler.fit(X) #X = scaler.transform(X) # 划分训练集和测试集 train_size = int(len(X) * 0.8) test_size = len(X) - train_size train, test = X[0:train_size, :], X[train_size:len(X), :] # 转换为监督学习问题 def create_dataset(dataset, look_back=1): X, Y = [], [] for i in range(len(dataset) - look_back - 1): a = dataset[i:(i + look_back), :] X.append(a) Y.append(dataset[i + look_back, 0]) return np.array(X), np.array(Y) look_back = 12 X_train, Y_train = create_dataset(train, look_back) #Y_train = train[:, 2:] # 取第三列及以后的数据 X_test, Y_test = create_dataset(test, look_back) #Y_test = test[:, 2:] # 取第三列及以后的数据 # 转换为3D张量 X_train = np.reshape(X_train, (X_train.shape[0], X_train.shape[1], 1)) X_test = np.reshape(X_test, (X_test.shape[0], X_test.shape[1], 1)) # 构建LSTM模型 model = Sequential() model.add(LSTM(units=50, return_sequences=True, input_shape=(X_train.shape[1], 1))) model.add(LSTM(units=50)) model.add(Dense(units=1)) model.compile(loss='mean_squared_error', optimizer='adam') model.fit(X_train, Y_train, epochs=5, batch_size=32) #model.fit(X_train, Y_train.reshape(Y_train.shape[0], 1), epochs=10, batch_size=32) # 预测下一个月的销量 last_month_sales = data.tail(12).iloc[:,2:].values #last_month_sales = data.tail(1)[:,2:].values last_month_sales = scaler.transform(last_month_sales) last_month_sales = np.reshape(last_month_sales, (1, look_back, 1)) next_month_sales = model.predict(last_month_sales) next_month_sales = scaler.inverse_transform(next_month_sales) print('Next month sales: %.0f' % next_month_sales[0][0]) # 计算RMSE误差 rmse = np.sqrt(np.mean((next_month_sales - last_month_sales) ** 2)) print('Test RMSE: %.3f' % rmse)IndexError Traceback (most recent call last) Cell In[1], line 36 33 X_test, Y_test = create_dataset(test, look_back) 34 #Y_test = test[:, 2:] # 取第三列及以后的数据 35 # 转换为3D张量 ---> 36 X_train = np.reshape(X_train, (X_train.shape[0], X_train.shape[1], 1)) 37 X_test = np.reshape(X_test, (X_test.shape[0], X_test.shape[1], 1)) 38 # 构建LSTM模型 IndexError: tuple index out of range代码修改

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