X_np_new.shape, y.shape
((50876, 2304), (50876, 9))
Code:
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense, Dropout, Activation
from tensorflow.keras.optimizers import SGD
model = Sequential()
model.add(Dense(5000, activation='relu', input_dim=X_np_new.shape[1]))
model.add(Dropout(0.1))
model.add(Dense(600, activation='relu'))
model.add(Dropout(0.1))
model.add(Dense(X_np_new.shape[1], activation='sigmoid'))
sgd = SGD(lr=0.01, decay=1e-6, momentum=0.9, nesterov=True)
model.compile(loss='categorical_crossentropy',
optimizer=sgd)
model.fit(X_np_new, y, epochs=5, batch_size=2000)
preds = model.predict(X_np_new)
I get error:
ValueError: Shapes (None, 9) and (None, 2304) are incompatible
What went wrong here?
Replace
model.add(Dense(X_np_new.shape[1], activation='sigmoid'))
With
model.add(Dense(y.shape[1], activation='sigmoid'))
Explanation:
Putting X_np_new.shape[1] in the last layer means you have 2304 classes because X_np_new.shape[1]=2304 but you actually have 9 classes that you can get that from y.shape[1].
ValueError: Shapes (None, 9) and (None, 2304) are incompatible
means that your model is expecting labels of Size [*, 2304] but your labels size is [*, 9].
Related
I've created sound classifier build using Keras from some tutorials in the internet. Here is my model code
import tensorflow as tf
from tensorflow.keras.models import Sequential
from tensorflow.keras.layers import Dense, InputLayer, Dropout, Conv1D, Conv2D, Flatten, Reshape, MaxPooling1D, MaxPooling2D, BatchNormalization, TimeDistributed
from tensorflow.keras.optimizers import Adam
model = Sequential()
model.add(Reshape((int(input_length / 40), 40), input_shape=(input_length, )))
model.add(Conv1D(8, kernel_size=3, activation='relu', padding='same'))
model.add(MaxPooling1D(pool_size=2, strides=2, padding='same'))
model.add(Dropout(0.25))
model.add(Conv1D(16, kernel_size=3, activation='relu', padding='same'))
model.add(MaxPooling1D(pool_size=2, strides=2, padding='same'))
model.add(Dropout(0.25))
model.add(Flatten())
model.add(Dense(classes, activation='softmax', name='y_pred'))
opt = Adam(lr=0.005, beta_1=0.9, beta_2=0.999)
# this controls the batch size, or you can manipulate the tf.data.Dataset objects yourself
BATCH_SIZE = 32
train_dataset = train_dataset.batch(BATCH_SIZE, drop_remainder=False)
validation_dataset = validation_dataset.batch(BATCH_SIZE, drop_remainder=False)
model.compile(loss='categorical_crossentropy', optimizer=opt, metrics=['accuracy'])
model.fit(train_dataset, epochs=1000, validation_data=validation_dataset, verbose=2, callbacks=callbacks)
My teacher ask me what is algorithm I use for classifying (he said something like K-NN, Naive Bayes, SVM or something like that), and I don't know what I'm using.
You're using a Convolutional Neural Network (CNN)
so I'm new right here and in Python also. I'm trying to make my own network. I found some pictures of docs and cats 15x15 and unfortunatly couldn't make this basic network...
So, these are libraries which I'm using
from tensorflow.keras.models import Sequential
from tensorflow.keras import utils
from tensorflow.keras.datasets import mnist
from tensorflow.keras.layers import Dense
import numpy as np
import matplotlib.pyplot as plt
import tensorflow as tf
import keras
from tensorflow.keras.layers import Conv2D
from tensorflow.keras.layers import MaxPooling2D
from tensorflow.keras.layers import GlobalMaxPooling2D
Body
train_dataset = tf.keras.preprocessing.image_dataset_from_directory(
'drive/MyDrive/cats vs dogs/cats vs dogs/training',
color_mode="rgb",
batch_size=32,
image_size=(150, 150),
shuffle=True,
seed=42,
validation_split=0.1,
subset='training',
interpolation="bilinear",
follow_links=False,
)
validation_dataset = tf.keras.preprocessing.image_dataset_from_directory(
'drive/MyDrive/cats vs dogs/cats vs dogs/training',
color_mode="rgb",
batch_size=32,
image_size=(150, 150),
shuffle=True,
seed=42,
validation_split=0.1,
subset='validation',
interpolation="bilinear",
follow_links=False,
)
test_dataset = tf.keras.preprocessing.image_dataset_from_directory(
'drive/MyDrive/cats vs dogs/cats vs dogs/test',
batch_size = 32,
image_size = (150, 150),
interpolation="bilinear"
)
model = Sequential()
model.add(keras.Input(shape=(150, 150, 3)))
model.add(Conv2D(32, 5, strides=2, activation="relu"))
model.add(Conv2D(32, 3, activation="relu"))
model.add(MaxPooling2D(3))
model.add(Dense(250, activation='sigmoid'))
model.add(Dense(100))
model.add(MaxPooling2D(3))
model.add(Dense(2))
model.summary()
model.compile(loss='binary_crossentropy',
optimizer='adam',
metrics=['accuracy'])
history = model.fit(train_dataset, validation_data=validation_dataset, epochs=5, verbose=2)
And I get this error
Incompatible shapes: [29] vs. [29,7,7,2]
[[node gradient_tape/binary_crossentropy/mul_1/BroadcastGradientArgs
(defined at /usr/local/lib/python3.7/dist-packages/keras/optimizer_v2/optimizer_v2.py:464)
]] [Op:__inference_train_function_4364]
Errors may have originated from an input operation.
Input Source operations connected to node
gradient_tape/binary_crossentropy/mul_1/BroadcastGradientArgs:
In[0] gradient_tape/binary_crossentropy/mul_1/Shape:
In[1] gradient_tape/binary_crossentropy/mul_1/Shape_1
I was trying to change from binary_crossentropy to categorical_crossentrapy but it didn't help, I suppose my mistake is in datasets or inputs but I don't know how to solve it :(
Really hope to find help here!
[my architecture][1]
[1]: https://i.stack.imgur.com/w4Y9N.png
You need to flatten your prediction somewhere, otherwise you are outputing an image (29 samples of size 7x7 with 2 channels), while you simply want a flat 2 dimensional logits (so shape 29x2). The architecture you are using is somewhat odd, did you mean to have flattening operation before first Dense layer, and then no "maxpooling2d" (as it makes no sense for flattened signal)? Mixing relu and sigmoid activations is also quite non standard, I would encourage you to start with established architectures rather than try to compose your own to get some intuitions.
model = Sequential()
model.add(keras.Input(shape=(150, 150, 3)))
model.add(Conv2D(32, 5, strides=2, activation="relu"))
model.add(Conv2D(32, 3, activation="relu"))
model.add(MaxPooling2D(3))
model.add(Flatten())
model.add(Dense(250, activation="relu"))
model.add(Dense(100, activation="relu"))
model.add(Dense(2))
model.summary()
This my script:
from tensorflow.keras.callbacks import EarlyStopping, ModelCheckpoint
model = Sequential()
model.add(Embedding(vocab_size, embedding_dim, input_length=train_padded.shape[1]))
model.add(Conv1D(48, 5, activation='relu', padding='valid'))
model.add(GlobalMaxPooling1D())
model.add(Dropout(0.5))
model.add(Flatten())
model.add(Dropout(0.5))
model.add(Dense(5, activation='softmax'))
model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
epochs = 100
batch_size = 32
history = model.fit(train_padded, training_labels, shuffle=True ,
epochs=epochs, batch_size=batch_size,
validation_split=0.2,
callbacks=[ReduceLROnPlateau(monitor='val_loss', factor=0.2, patience=3, min_lr=0.0001),
EarlyStopping(monitor='val_loss', mode='min', patience=3, verbose=1),
EarlyStopping(monitor='val_accuracy', mode='max', patience=3, verbose=1)])
I have an error:
ValueError: Shapes (None, 4) and (None, 5) are incompatible
Have you any idea please.
This is the original notebook: https://github.com/snymanje/MultiClass-Text-Classification-with-Tensorflow/blob/master/MultiClass_Text_Classification_with_Tensorflow.ipynb
When I added my database, I git this error when fitting the model.
Thank you
Looks like your labels don't tie to your model.
Try changing this line:
model.add(Dense(4, activation='softmax'))
I need to run the following method after every 5K iterations.
def evaluation_matrix(path_true,path_pred):
print(path_true,"\n",path_pred)
true_list_new, pred_list_new = read_from_folder(path_true = path_true , path_pred = path_pred)
try:
scikit_metrix(true_list_new = true_list_new,pred_list_new = pred_list_new)
except:
print("An exception occurred")
I'm hoping to use it as a callback in model.fit_generator function. How to achive this? That is parameter passing + 5K interval?
history = model.fit_generator(generator = myGene, steps_per_epoch=steps_per_epoch, epochs=epoch, verbose = 1, callbacks=[],shuffle=True)
A custom callback is a powerful tool to customize the behavior of a Keras model during training, evaluation, or inference.
Below is an example where we are calculating gradient after every epochs. Similarly you can do more customize with many inbuilt methods. You can find more about it here - https://www.tensorflow.org/guide/keras/custom_callback
Note: I was using tensorflow 1.15.0
# (1) Importing dependency
import tensorflow as tf
import keras
from keras import backend as K
from keras.models import Sequential
from keras.layers import Dense, Activation, Dropout, Flatten, Conv2D, MaxPooling2D
from keras.layers.normalization import BatchNormalization
import numpy as np
np.random.seed(1000)
# (2) Get Data
import tflearn.datasets.oxflower17 as oxflower17
x, y = oxflower17.load_data(one_hot=True)
# (3) Create a sequential model
model = Sequential()
# 1st Convolutional Layer
model.add(Conv2D(filters=96, input_shape=(224,224,3), kernel_size=(11,11), strides=(4,4), padding='valid'))
model.add(Activation('relu'))
# Pooling
model.add(MaxPooling2D(pool_size=(2,2), strides=(2,2), padding='valid'))
# Batch Normalisation before passing it to the next layer
model.add(BatchNormalization())
# 2nd Convolutional Layer
model.add(Conv2D(filters=256, kernel_size=(11,11), strides=(1,1), padding='valid'))
model.add(Activation('relu'))
# Pooling
model.add(MaxPooling2D(pool_size=(2,2), strides=(2,2), padding='valid'))
# Batch Normalisation
model.add(BatchNormalization())
# 3rd Convolutional Layer
model.add(Conv2D(filters=384, kernel_size=(3,3), strides=(1,1), padding='valid'))
model.add(Activation('relu'))
# Batch Normalisation
model.add(BatchNormalization())
# 4th Convolutional Layer
model.add(Conv2D(filters=384, kernel_size=(3,3), strides=(1,1), padding='valid'))
model.add(Activation('relu'))
# Batch Normalisation
model.add(BatchNormalization())
# 5th Convolutional Layer
model.add(Conv2D(filters=256, kernel_size=(3,3), strides=(1,1), padding='valid'))
model.add(Activation('relu'))
# Pooling
model.add(MaxPooling2D(pool_size=(2,2), strides=(2,2), padding='valid'))
# Batch Normalisation
model.add(BatchNormalization())
# Passing it to a dense layer
model.add(Flatten())
# 1st Dense Layer
model.add(Dense(4096, input_shape=(224*224*3,)))
model.add(Activation('relu'))
# Add Dropout to prevent overfitting
model.add(Dropout(0.4))
# Batch Normalisation
model.add(BatchNormalization())
# 2nd Dense Layer
model.add(Dense(4096))
model.add(Activation('relu'))
# Add Dropout
model.add(Dropout(0.4))
# Batch Normalisation
model.add(BatchNormalization())
# 3rd Dense Layer
model.add(Dense(1000))
model.add(Activation('relu'))
# Add Dropout
model.add(Dropout(0.4))
# Batch Normalisation
model.add(BatchNormalization())
# Output Layer
model.add(Dense(17))
model.add(Activation('softmax'))
model.summary()
# (4) Compile
model.compile(loss='categorical_crossentropy', optimizer='adam', metrics=['accuracy'])
epoch_gradient = []
# Define the Required Callback Function
class GradientCalcCallback(tf.keras.callbacks.Callback):
def get_gradient_func(model):
grads = K.gradients(model.total_loss, model.trainable_weights)
inputs = model.model._feed_inputs + model.model._feed_targets + model.model._feed_sample_weights
func = K.function(inputs, grads)
return func
def on_epoch_end(self, epoch, logs=None):
get_gradient = get_gradient_func(model)
grads = get_gradient([x, y, np.ones(len(y))])
epoch_gradient.append(grads)
model.fit(x, y, batch_size=64, epochs= 4, verbose=1, validation_split=0.2, shuffle=True, callbacks=[GradientCalcCallback()])
# (7) Convert to a 2 dimensiaonal array of (epoch, gradients) type
gradient = np.asarray(epoch_gradient)
print("Total number of epochs run:", epoch)
print("Gradient Array has the shape:",gradient.shape)
I have a data base with this shape: (1400000, 44)
which the 44th column is output.
all numbers are float and between 0 and 1. I used a Tensorflow like below but the loss function is non and the acc is zero.
# Create network with Keras
import tensorflow as tf
from keras.models import Sequential
from keras.layers import Dense
import numpy as np
dataset=np.loadtxt("Dataset5.txt")
s=dataset.size
tr_size=int( 0.7*s)
X = dataset[0:tr_size,0:43]
Y = dataset[0:tr_size,43]
# create model
model = Sequential()
model.add(Dense(64, input_dim=43, init='uniform', activation='relu'))
model.add(Dense(16, init='uniform', activation='relu'))
model.add(Dense(4, init='uniform', activation='sigmoid'))
model.add(Dense(1, init='uniform', activation='relu'))
# Compile model
model.compile(loss='mean_squared_error', optimizer='adam', metrics=['accuracy'])
# Fit the model
model.fit(X, Y, epochs=150, batch_size=1000, verbose=2)
# calculate predictions
predictions = model.predict(X)