library(tidyverse)
library(magrittr)
library(keras)
To make these notions absolutely unambiguous, let’s write a naive R
implementation of the forward pass of the simple RNN.
# We define a function that produces a "random" array
random_array <- function(dim) {
array(runif(prod(dim)), dim = dim)
}
# We define some constants as arguments for the functions to come
timesteps <- 100 # Number of timesteps in the input sequence
input_features <- 32 # Dimensionality of the input feature space
output_features <- 64 # Dimensionality of the output feature space
# We create the initial inputs
inputs <- random_array(dim = c(timesteps, input_features)) # Input data: random noise for the sake of the example
state_t <- rep_len(0, length = c(output_features)) # Initial state t: an all-zero vector
# We create some random matrices for W, U, b
W <- random_array(dim = c(output_features, input_features)) # Creates random weight matrices: W
U <- random_array(dim = c(output_features, output_features)) # Creates random weight matrices: U
b <- random_array(dim = c(output_features, 1)) # Creates random weight matrices: b
# We create an empty array for the output sequence
output_sequence <- array(0, dim = c(timesteps, output_features))
dim(output_sequence)
[1] 100 64
head(output_sequence[,1:5])
[,1] [,2] [,3] [,4] [,5]
[1,] 0 0 0 0 0
[2,] 0 0 0 0 0
[3,] 0 0 0 0 0
[4,] 0 0 0 0 0
[5,] 0 0 0 0 0
[6,] 0 0 0 0 0
So, we just made up an random inputs
array, lets take a little look:
dim(inputs)
[1] 100 32
head(inputs[,1:5])
[,1] [,2] [,3] [,4] [,5]
[1,] 0.4374455 0.65958703 0.8908022 0.30223137 0.1398738
[2,] 0.4993365 0.04578802 0.6532554 0.87700350 0.9450578
[3,] 0.8464301 0.60858042 0.3293128 0.99067676 0.8256690
[4,] 0.8522938 0.63519020 0.3309987 0.09233357 0.6345082
[5,] 0.5475497 0.60797047 0.4218896 0.34651074 0.6111947
[6,] 0.6299324 0.19615404 0.2303865 0.55745211 0.9669684
There we go. We created an 2d tensor, where we have an vector of 32 features over 100 timesteps. Likewise, we created a random weight matrix W
(weights for t
) and U
(weights for t-1
) of dimensionality 64x32 (we want 64 outputs), and a bias vector of lenght 64.
dim(W)
[1] 64 32
head(W[,1:5])
[,1] [,2] [,3] [,4] [,5]
[1,] 0.05131798 0.4428372 0.047965156 0.9116978 0.05780573
[2,] 0.41738887 0.7932492 0.647385459 0.9647217 0.46568377
[3,] 0.11388474 0.9096280 0.009517771 0.1819730 0.78334617
[4,] 0.31752881 0.7400719 0.889261930 0.1602679 0.80351720
[5,] 0.49609406 0.1952676 0.134865081 0.4120722 0.97223370
[6,] 0.29625469 0.9341890 0.563066539 0.1283034 0.63314607
All set up, lets run a loop, where we apply some activation function (here tanh()
) on the weighted input_t
, but we add the (in another way) weighted state_t
(the lagged value of input_t
\(\rightarrow\) input_t-1
).
Note: I use tanh()
just as an example for whatever activation function you might want to apply to your inputs. tanh()
(hyperbolic tangent) is popular for RNNs, since it squishes input values between a range of [-1,1]
for (i in 1:nrow(inputs)) {
input_t <- inputs[i,] # input_t is a vector of shape (input_features)
output_t <- tanh(as.numeric((W %*% input_t) + (U %*% state_t) + b)) # Combines the input with the current state (the previous output)
output_sequence[i,] <- as.numeric(output_t) # Updates the result matrix
state_t <- output_t # Updates the state of the network for the next timestep
}
glimpse(output_sequence)
num [1:100, 1:64] 1 1 1 1 1 ...
Note: In U %*% state_t
, the %*%
operator performs a real matrix multiplication (every element of U
gets multiplied with every element of state_t
), not the dotproduct (cell-wise multiplication), as U * state_t
would.
Easy enough: in summary, an RNN is an neural network application of a for()
(reuses values computed during the previous iteration of the loop), nothing more. Of course, there are many different RNNs fitting this definition that you could build—this example is one of the simplest RNN formulations. Anyhow, In case we would not have to train the weights, we are done by here.
RNNs are characterized by their step function, such as the following function in this case
output_t <- tanh(as.numeric((W %*% input_t) + (U %*% state_t) + b))
glimpse(output_t)
num [1:64] 1 1 1 1 1 1 1 1 1 1 ...
So, that’s pretty much how to construct a recurrent layer “by hand”. Most probably you will never have to, but I like to believe it demystifies the whole process.Moving on…
Keras
The process you just naively implemented in R
corresponds to an actual Keras
layer: layer_simple_rnn
layer_simple_rnn(units = 32)
Like all recurrent layers in Keras
, layer_simple_rnn
can be run in two different modes:
(batch_size, timesteps, output_features)
)(batch_size, output_features)
).These two modes are controlled by the return_sequences
constructor argument. Let’s look at an example that uses layer_simple_rnn
and returns only the output at the last timestep:
model <- keras_model_sequential() %>%
layer_embedding(input_dim = 10000, output_dim = 32) %>% # About this type of layer, we talk later
layer_simple_rnn(units = 32)
2020-11-26 13:34:36.818008: I tensorflow/core/platform/cpu_feature_guard.cc:143] Your CPU supports instructions that this TensorFlow binary was not compiled to use: AVX2 FMA
2020-11-26 13:34:36.837779: I tensorflow/compiler/xla/service/service.cc:168] XLA service 0x7f8aa920f6c0 initialized for platform Host (this does not guarantee that XLA will be used). Devices:
2020-11-26 13:34:36.837835: I tensorflow/compiler/xla/service/service.cc:176] StreamExecutor device (0): Host, Default Version
summary(model)
Model: "sequential"
______________________________________________________________________________________________________________
Layer (type) Output Shape Param #
==============================================================================================================
embedding (Embedding) (None, None, 32) 320000
______________________________________________________________________________________________________________
simple_rnn (SimpleRNN) (None, 32) 2080
==============================================================================================================
Total params: 322,080
Trainable params: 322,080
Non-trainable params: 0
______________________________________________________________________________________________________________
The following example in turn returns the full state sequence (return_sequences = TRUE
):
model_sequence <- keras_model_sequential() %>%
layer_embedding(input_dim = 10000, output_dim = 32) %>%
layer_simple_rnn(units = 32, return_sequences = TRUE)
summary(model_sequence)
Model: "sequential_1"
______________________________________________________________________________________________________________
Layer (type) Output Shape Param #
==============================================================================================================
embedding_1 (Embedding) (None, None, 32) 320000
______________________________________________________________________________________________________________
simple_rnn_1 (SimpleRNN) (None, None, 32) 2080
==============================================================================================================
Total params: 322,080
Trainable params: 322,080
Non-trainable params: 0
______________________________________________________________________________________________________________
It’s sometimes useful to stack several recurrent layers one after the other in order to increase the representational power of a network. In such a setup, you have to get all of the intermediate layers to return full sequences. More on that later.
model_sequence_stacked <- keras_model_sequential() %>%
layer_embedding(input_dim = 10000, output_dim = 32) %>%
layer_simple_rnn(units = 32, return_sequences = TRUE) %>%
layer_simple_rnn(units = 32, return_sequences = FALSE)
summary(model_sequence_stacked)
Model: "sequential_2"
______________________________________________________________________________________________________________
Layer (type) Output Shape Param #
==============================================================================================================
embedding_2 (Embedding) (None, None, 32) 320000
______________________________________________________________________________________________________________
simple_rnn_3 (SimpleRNN) (None, None, 32) 2080
______________________________________________________________________________________________________________
simple_rnn_2 (SimpleRNN) (None, 32) 2080
==============================================================================================================
Total params: 324,160
Trainable params: 324,160
Non-trainable params: 0
______________________________________________________________________________________________________________
So, lets start applying a first RNN, and since you are already warmed up, we do it with text data. It is not hard to see why for making sense of text data, sequential models would be a good idea.
You’ll work with the IMDB dataset: a set of 50,000 highly polarized movie reviews from the Internet Movie Database, labeled by sentiment (positive/negative). They’re split into 25,000 reviews for training and 25,000 reviews for testing, each set consisting of 50% negative and 50% positive reviews. Read more details here. in case you are interested.
Just like the MNIST dataset, the IMDB dataset comes packaged with Keras
, and is already neathly preprocessed. Each review is encoded as a sequence of word indexes (integers), where each integer stands for a specific word in a dictionary. For convenience, words are indexed by overall frequency in the dataset, so that for instance the integer 3
encodes the 3rd most frequent word in the data. This allows for quick filtering operations such as: “only consider the top 10,000
most common words, but eliminate the top 20
most common words” (Note: 0
is the encoding for unknown words).
imdb <- dataset_imdb(num_words = 10000)
#c(c(train_data, train_labels), c(test_data, test_labels)) %<-% imdb
Note: The datasets built into Keras are all nested lists of training and test data. Here, we use the multi-assignment operator %<-%
from the zeallot
package to unpack the list into a set of distinct variables. This is only a convenience function, and could equally be written as follows:
train_data <- imdb$train$x
train_labels <- imdb$train$y
test_data <- imdb$test$x
test_labels <- imdb$test$y
The argument num_words = 10000
means we keep only the top 10,000 most frequently occurring words in the training data. Rare words will be discarded. This allows you to work with vector data of a manageable size.
The variables train_data
and test_data
are lists of reviews; each review is a list of word indices (encoding a sequence of words). train_labels
and test_labels
are lists of 0s and 1s, where 0
stands for negative and 1
stands for positive:
glimpse(train_labels[1:5])
int [1:5] 1 0 0 1 0
glimpse(train_data[1:5])
List of 5
$ : int [1:218] 1 14 22 16 43 530 973 1622 1385 65 ...
$ : int [1:189] 1 194 1153 194 8255 78 228 5 6 1463 ...
$ : int [1:141] 1 14 47 8 30 31 7 4 249 108 ...
$ : int [1:550] 1 4 2 2 33 2804 4 2040 432 111 ...
$ : int [1:147] 1 249 1323 7 61 113 10 10 13 1637 ...
Because you’re restricting yourself to the top 10,000 most frequent words, no word index will exceed 10,000:
train_data %>% map_int(max) %>% max()
[1] 9999
Sidenote: Notice that all words are not appearing anymore as strings, but as a numeric index. This is very pratical to do as preprocesing of text data before using them for ML workflows. However, we cannot read the reviews anymore manyally. Only for fun, here’s how you can quickly decode one of these reviews back to English words:
word_index <- dataset_imdb_word_index() # word_index is a named list mapping words to an integer index.
word_index %>% head()
word_index %<>% as_tibble() %>%
pivot_longer(everything())
word_index %>% head()
review_words <- train_data[[1]] %>% as_tibble() %>%
left_join(word_index, by = 'value')
review_words %>% pull(name) %>% paste(collapse = ' ')
[1] "the as you with out themselves powerful lets loves their becomes reaching had journalist of lot from anyone to have after out atmosphere never more room and it so heart shows to years of every never going and help moments or of every chest visual movie except her was several of enough more with is now current film as you of mine potentially unfortunately of you than him that with out themselves her get for was camp of you movie sometimes movie that with scary but and to story wonderful that in seeing in character to of 70s musicians with heart had shadows they of here that with her serious to have does when from why what have critics they is you that isn't one will very to as itself with other and in of seen over landed for anyone of and br show's to whether from than out themselves history he name half some br of and odd was two most of mean for 1 any an boat she he should is thought frog but of script you not while history he heart to real at barrel but when from one bit then have two of script their with her nobody most that with wasn't to with armed acting watch an for with heartfelt film want an"
So, we have our data ready. However, we cannot can’t feed lists of integers (keep in mind, they are supposed to not represent numbers but words) into a neural network. You have to turn your lists into tensors. There are two ways to do that:
[3, 5]
into a 10,000-dimensional vector that would be all 0s except for indices 3
and 5
, which would be 1
. Then you could use as the first layer in your network a dense layer, capable of handling floating-point vector data.(samples, word_indices)
, and then use as the first layer in your network a layer capable of handling such integer tensors (the “embedding” layer, comming soon).While the first approach sounds computationally very inefficient, it is also the most intuitive to operationalize in terms of data-munging. Let’s warm up with this first solution and vectorize the data, which we will do manually for maximum clarity.
# Again, a small function that creates a 0-matrix, and replaces the corresponding words with 1.
vectorize_sequences <- function(sequences, dimension) {
results <- matrix(0, nrow = length(sequences), ncol = dimension) # Creates an all-zero matrix of shape (length(sequences), dimension)
for(i in 1:length(sequences)){
results[i, sequences[[i]]] <- 1 # Sets specific indices of results[i] to 1s
}
return(results)
}
x_train <- train_data %>% vectorize_sequences(dimension = 10000)
x_test <- test_data %>% vectorize_sequences(dimension = 10000)
Here’s what the samples look like now:
str(x_train[1,])
num [1:10000] 1 1 0 1 1 1 1 1 1 0 ...
Hint: The keras
function to_categorical()
, which does exactly the same more convenient when the data is in a dataframe shape.
We now only recode the outcomes as numerical.
y_train <- as.numeric(train_labels)
y_test <- as.numeric(test_labels)
Now the data is ready to be fed into a neural network.
So far so good, let’s run a “normal” feed-forward ANN to predict the review sentiment. We do so, just to warm up and get a sense how good it performs. A little reminder, to build and run a Keras
model, you need to:
1: Define the architecture (Layers, shape & activation) 2: Compile the model (choosing optimizer, loss function, and metric) 3: Run the model
We use, like before, a simple feed forward architecture with an input layer of shape 10.000 (number of words in our review vector), 2 inetrmediate hidden layers with 16 units each, and an ouput layer with only 1 unit (since we perform a binary classification). For the hidden layers, we use the standard relu
activation function, for the output we use sigmoid
, as common for binary classification. Note that all architecture choices in this example are standard, but not necessarily informed by our data. Just a good rule-of-thumb starting point.
model <- keras_model_sequential() %>%
layer_dense(units = 16, activation = "relu", input_shape = c(10000)) %>%
layer_dense(units = 16, activation = "relu") %>%
layer_dense(units = 1, activation = "sigmoid")
Finally, you need to choose a loss function and an optimizer. Because you’re facing a binary classification problem and the output of your network is a probability (you end your network with a single-unit layer with a sigmoid activation), it’s best to use the binary_crossentropy
loss. It isn’t the only viable choice: you could use, for instance, mean_squared_error
. But crossentropy is usually the best choice when you’re dealing with models that output probabilities. Crossentropy is a quantity from the field of Information Theory that measures the distance between probability distributions or, in this case, between the ground-truth distribution and your predictions. For the optimizer we go for the allrounder rmsprop
, since we in this case have no reason to believe otherwise.
model %>% compile(
optimizer = "adam",
loss = "binary_crossentropy",
metrics = "accuracy"
)
So, we are pretty much done. Due to the big fiorst layer, we have a lot of parameter, but otherwise nothing extraordinary happening yet.
summary(model)
Model: "sequential_3"
______________________________________________________________________________________________________________
Layer (type) Output Shape Param #
==============================================================================================================
dense_2 (Dense) (None, 16) 160016
______________________________________________________________________________________________________________
dense_1 (Dense) (None, 16) 272
______________________________________________________________________________________________________________
dense (Dense) (None, 1) 17
==============================================================================================================
Total params: 160,305
Trainable params: 160,305
Non-trainable params: 0
______________________________________________________________________________________________________________
Lets run it!
history_ann <- model %>% fit(
x_train,
y_train,
epochs = 10,
batch_size = 512,
validation_split = 0.25
)
Epoch 1/10
1/37 [..............................] - ETA: 0s - loss: 0.7031 - accuracy: 0.4961
3/37 [=>............................] - ETA: 0s - loss: 0.6969 - accuracy: 0.4818
7/37 [====>.........................] - ETA: 0s - loss: 0.6890 - accuracy: 0.5505
10/37 [=======>......................] - ETA: 0s - loss: 0.6828 - accuracy: 0.5619
13/37 [=========>....................] - ETA: 0s - loss: 0.6755 - accuracy: 0.5739
16/37 [===========>..................] - ETA: 0s - loss: 0.6681 - accuracy: 0.5903
19/37 [==============>...............] - ETA: 0s - loss: 0.6589 - accuracy: 0.6101
22/37 [================>.............] - ETA: 0s - loss: 0.6485 - accuracy: 0.6295
25/37 [===================>..........] - ETA: 0s - loss: 0.6386 - accuracy: 0.6450
28/37 [=====================>........] - ETA: 0s - loss: 0.6293 - accuracy: 0.6608
31/37 [========================>.....] - ETA: 0s - loss: 0.6206 - accuracy: 0.6764
34/37 [==========================>...] - ETA: 0s - loss: 0.6107 - accuracy: 0.6899
37/37 [==============================] - 1s 21ms/step - loss: 0.6035 - accuracy: 0.6983
37/37 [==============================] - 2s 63ms/step - loss: 0.6035 - accuracy: 0.6983 - val_loss: 0.4827 - val_accuracy: 0.8339
Epoch 2/10
1/37 [..............................] - ETA: 0s - loss: 0.4659 - accuracy: 0.8594
5/37 [===>..........................] - ETA: 0s - loss: 0.4492 - accuracy: 0.8770
9/37 [======>.......................] - ETA: 0s - loss: 0.4347 - accuracy: 0.8787
13/37 [=========>....................] - ETA: 0s - loss: 0.4249 - accuracy: 0.8758
17/37 [============>.................] - ETA: 0s - loss: 0.4143 - accuracy: 0.8795
21/37 [================>.............] - ETA: 0s - loss: 0.4020 - accuracy: 0.8820
24/37 [==================>...........] - ETA: 0s - loss: 0.3969 - accuracy: 0.8810
27/37 [====================>.........] - ETA: 0s - loss: 0.3890 - accuracy: 0.8825
32/37 [========================>.....] - ETA: 0s - loss: 0.3785 - accuracy: 0.8855
37/37 [==============================] - 1s 15ms/step - loss: 0.3687 - accuracy: 0.8877
37/37 [==============================] - 1s 27ms/step - loss: 0.3687 - accuracy: 0.8877 - val_loss: 0.3224 - val_accuracy: 0.8797
Epoch 3/10
1/37 [..............................] - ETA: 0s - loss: 0.2877 - accuracy: 0.9004
5/37 [===>..........................] - ETA: 0s - loss: 0.2581 - accuracy: 0.9223
9/37 [======>.......................] - ETA: 0s - loss: 0.2473 - accuracy: 0.9273
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19/37 [==============>...............] - ETA: 0s - loss: 0.2442 - accuracy: 0.9249
23/37 [=================>............] - ETA: 0s - loss: 0.2396 - accuracy: 0.9254
27/37 [====================>.........] - ETA: 0s - loss: 0.2374 - accuracy: 0.9256
30/37 [=======================>......] - ETA: 0s - loss: 0.2345 - accuracy: 0.9267
34/37 [==========================>...] - ETA: 0s - loss: 0.2320 - accuracy: 0.9265
37/37 [==============================] - 1s 15ms/step - loss: 0.2321 - accuracy: 0.9259
37/37 [==============================] - 1s 27ms/step - loss: 0.2321 - accuracy: 0.9259 - val_loss: 0.2739 - val_accuracy: 0.8898
Epoch 4/10
1/37 [..............................] - ETA: 0s - loss: 0.1671 - accuracy: 0.9531
5/37 [===>..........................] - ETA: 0s - loss: 0.1751 - accuracy: 0.9484
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17/37 [============>.................] - ETA: 0s - loss: 0.1724 - accuracy: 0.9497
20/37 [===============>..............] - ETA: 0s - loss: 0.1710 - accuracy: 0.9495
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36/37 [============================>.] - ETA: 0s - loss: 0.1675 - accuracy: 0.9472
37/37 [==============================] - 1s 15ms/step - loss: 0.1673 - accuracy: 0.9473
37/37 [==============================] - 1s 25ms/step - loss: 0.1673 - accuracy: 0.9473 - val_loss: 0.2730 - val_accuracy: 0.8898
Epoch 5/10
1/37 [..............................] - ETA: 0s - loss: 0.1260 - accuracy: 0.9648
5/37 [===>..........................] - ETA: 0s - loss: 0.1350 - accuracy: 0.9598
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16/37 [===========>..................] - ETA: 0s - loss: 0.1259 - accuracy: 0.9653
20/37 [===============>..............] - ETA: 0s - loss: 0.1258 - accuracy: 0.9654
24/37 [==================>...........] - ETA: 0s - loss: 0.1249 - accuracy: 0.9652
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33/37 [=========================>....] - ETA: 0s - loss: 0.1265 - accuracy: 0.9638
36/37 [============================>.] - ETA: 0s - loss: 0.1274 - accuracy: 0.9632
37/37 [==============================] - 1s 14ms/step - loss: 0.1279 - accuracy: 0.9627
37/37 [==============================] - 1s 24ms/step - loss: 0.1279 - accuracy: 0.9627 - val_loss: 0.2897 - val_accuracy: 0.8878
Epoch 6/10
1/37 [..............................] - ETA: 0s - loss: 0.1041 - accuracy: 0.9707
5/37 [===>..........................] - ETA: 0s - loss: 0.0985 - accuracy: 0.9766
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32/37 [========================>.....] - ETA: 0s - loss: 0.0996 - accuracy: 0.9734
36/37 [============================>.] - ETA: 0s - loss: 0.0990 - accuracy: 0.9731
37/37 [==============================] - 0s 13ms/step - loss: 0.0987 - accuracy: 0.9732
37/37 [==============================] - 1s 23ms/step - loss: 0.0987 - accuracy: 0.9732 - val_loss: 0.3114 - val_accuracy: 0.8853
Epoch 7/10
1/37 [..............................] - ETA: 0s - loss: 0.0590 - accuracy: 0.9941
6/37 [===>..........................] - ETA: 0s - loss: 0.0769 - accuracy: 0.9805
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28/37 [=====================>........] - ETA: 0s - loss: 0.0737 - accuracy: 0.9830
32/37 [========================>.....] - ETA: 0s - loss: 0.0738 - accuracy: 0.9825
36/37 [============================>.] - ETA: 0s - loss: 0.0752 - accuracy: 0.9820
37/37 [==============================] - 0s 13ms/step - loss: 0.0753 - accuracy: 0.9820
37/37 [==============================] - 1s 22ms/step - loss: 0.0753 - accuracy: 0.9820 - val_loss: 0.3387 - val_accuracy: 0.8806
Epoch 8/10
1/37 [..............................] - ETA: 0s - loss: 0.0676 - accuracy: 0.9883
5/37 [===>..........................] - ETA: 0s - loss: 0.0526 - accuracy: 0.9922
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14/37 [==========>...................] - ETA: 0s - loss: 0.0589 - accuracy: 0.9874
19/37 [==============>...............] - ETA: 0s - loss: 0.0563 - accuracy: 0.9883
23/37 [=================>............] - ETA: 0s - loss: 0.0557 - accuracy: 0.9888
27/37 [====================>.........] - ETA: 0s - loss: 0.0560 - accuracy: 0.9889
31/37 [========================>.....] - ETA: 0s - loss: 0.0575 - accuracy: 0.9877
36/37 [============================>.] - ETA: 0s - loss: 0.0585 - accuracy: 0.9875
37/37 [==============================] - 0s 13ms/step - loss: 0.0585 - accuracy: 0.9875
37/37 [==============================] - 1s 21ms/step - loss: 0.0585 - accuracy: 0.9875 - val_loss: 0.3883 - val_accuracy: 0.8806
Epoch 9/10
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37/37 [==============================] - 0s 13ms/step - loss: 0.0434 - accuracy: 0.9923
37/37 [==============================] - 1s 21ms/step - loss: 0.0434 - accuracy: 0.9923 - val_loss: 0.4018 - val_accuracy: 0.8768
Epoch 10/10
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37/37 [==============================] - 0s 12ms/step - loss: 0.0317 - accuracy: 0.9958
37/37 [==============================] - 1s 20ms/step - loss: 0.0317 - accuracy: 0.9958 - val_loss: 0.4379 - val_accuracy: 0.8762
And lets take a look how the accuracy and loss developed over the epocs.
plot(history_ann)
Ok, agaion we see that we are overfitting. While accuracy and loss as in most cases further increases during the epocs, we see after 3 epocs the metrics to decline on our validation data. At one point we have to deal with that, but not now.
Lets just sum up:
(sample, features)
to a simple feed-forward network with pretty standard architectureI would say, not too bad at all. However, represenmting a review as a 10.000 dimensional vector of one-hot encodings of word occurence appears pretty blunt. There must be something better, right?
Keras
So, now that we tried a pretty naive model as baseline, lets move on.
In our first baseline model, we used a document-term matrix as inputs for training, with one-hot-encodings (= dummy variables) for the 10.000 most popular terms. This has a couple of disadvantages. Besides being a very large and sparse vector for every review, as a “bag-of-words”, it did not take the word-order (sequence) into account.
This time, we use a different approach, therefore also need a different input data-structure. We now use pad_sequences()
to create a integer tensor of shape (samples, word_indices)
. However, reviews vary in lenght, which is a problem since Keras
reqieres the inputs to have the same shape across the whole sample. Therefore, we use the maxlen = 500
argument, to restrict ourselves to the first 500 words in every review.
As a consequence, longer reviews will be cut at 500 words, and shorter reviews will be filled up with 0 values.
x_train <- pad_sequences(train_data, maxlen = 500)
x_test <- pad_sequences(test_data, maxlen = 500)
Lets take a look:
glimpse(x_train)
int [1:25000, 1:500] 0 0 0 687 0 0 0 4 0 0 ...
We see that we indeed end up with word sequences. However, also notice that we have quite a bunch of 0
s, representing unknown words.
Lets set up our model. as discussed, we will first use a layer_embedding
to compress our initial one-hot-encoding vector of lenght 10.000 to a “meaning-vector” (=embedding) of the lower dimensionality of 32. We did not talk about that too much, but the next session will dig deeper into that. Just take it for now…
Then we add a layer_simple_rnn
on top, and finally a layer_dense
for the binary prediction of review sentiment.
model_rnn <- keras_model_sequential() %>%
layer_embedding(input_dim = 10000, output_dim = 32) %>%
layer_simple_rnn(units = 32, activation = "tanh") %>%
layer_dense(units = 1, activation = "sigmoid")
summary(model_rnn)
Model: "sequential_4"
_________________________________________________________________________________________________
Layer (type) Output Shape Param #
=================================================================================================
embedding_3 (Embedding) (None, None, 32) 320000
_________________________________________________________________________________________________
simple_rnn_4 (SimpleRNN) (None, 32) 2080
_________________________________________________________________________________________________
dense_3 (Dense) (None, 1) 33
=================================================================================================
Total params: 322,113
Trainable params: 322,113
Non-trainable params: 0
_________________________________________________________________________________________________
THe further parameters are quite conventional and by now well-known.
model_rnn %>% compile(
optimizer = "adam",
loss = "binary_crossentropy",
metrics = "accuracy"
)
And we already run the model:
history_rnn <- model_rnn %>% fit(
x_train, y_train,
epochs = 10,
batch_size = 128,
validation_split = 0.25
)
Epoch 1/10
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147/147 [==============================] - 28s 192ms/step - loss: 0.6850 - accuracy: 0.5474
147/147 [==============================] - 31s 209ms/step - loss: 0.6850 - accuracy: 0.5474 - val_loss: 0.6713 - val_accuracy: 0.5750
Epoch 2/10
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147/147 [==============================] - 24s 162ms/step - loss: 0.5836 - accuracy: 0.7271
147/147 [==============================] - 26s 176ms/step - loss: 0.5836 - accuracy: 0.7271 - val_loss: 0.6386 - val_accuracy: 0.6221
Epoch 3/10
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147/147 [==============================] - 22s 153ms/step - loss: 0.3639 - accuracy: 0.8652
147/147 [==============================] - 24s 165ms/step - loss: 0.3639 - accuracy: 0.8652 - val_loss: 0.7341 - val_accuracy: 0.6195
Epoch 4/10
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147/147 [==============================] - 22s 152ms/step - loss: 0.1438 - accuracy: 0.9597
147/147 [==============================] - 24s 166ms/step - loss: 0.1438 - accuracy: 0.9597 - val_loss: 0.9010 - val_accuracy: 0.6213
Epoch 5/10
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147/147 [==============================] - 23s 155ms/step - loss: 0.0352 - accuracy: 0.9957
147/147 [==============================] - 25s 169ms/step - loss: 0.0352 - accuracy: 0.9957 - val_loss: 1.0697 - val_accuracy: 0.6170
Epoch 6/10
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147/147 [==============================] - 24s 160ms/step - loss: 0.0086 - accuracy: 1.0000
147/147 [==============================] - 26s 174ms/step - loss: 0.0086 - accuracy: 1.0000 - val_loss: 1.1863 - val_accuracy: 0.6126
Epoch 7/10
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147/147 [==============================] - 23s 158ms/step - loss: 0.0036 - accuracy: 1.0000
147/147 [==============================] - 25s 171ms/step - loss: 0.0036 - accuracy: 1.0000 - val_loss: 1.2577 - val_accuracy: 0.6131
Epoch 8/10
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147/147 [==============================] - 22s 150ms/step - loss: 0.0021 - accuracy: 1.0000
147/147 [==============================] - 24s 163ms/step - loss: 0.0021 - accuracy: 1.0000 - val_loss: 1.3165 - val_accuracy: 0.6075
Epoch 9/10
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147/147 [==============================] - 26s 174ms/step - loss: 0.0015 - accuracy: 1.0000 - val_loss: 1.3674 - val_accuracy: 0.6075
Epoch 10/10
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147/147 [==============================] - 22s 147ms/step - loss: 0.0011 - accuracy: 1.0000
147/147 [==============================] - 24s 160ms/step - loss: 0.0011 - accuracy: 1.0000 - val_loss: 1.4042 - val_accuracy: 0.6062
Yes, I know, this one takes a while…
history_rnn %>% plot()
In adittion, the model performs quite dissapointing. After a couple of epochs, it starts overfitting, as often. However, the highest validation accuracy we get during the epochs is slightly higher than 85%, which is no improvement compared to our baseling. Part of the problem is that your inputs only consider the first 500 words, rather than full sequences—hence, the RNN has access to less information than the earlier baseline model.
The insight of the problem is that layer_simple_rnn
isn’t good at processing long sequences, such as 500+ words review text. The reason is that words often derive their meaning not only from the one word before, but a longer sequence, eg. the whole sentence in which they occur. For such settings, other types of recurrent layers perform much better. Let’s go on exploring.
model_lstm <- keras_model_sequential() %>%
layer_embedding(input_dim = 10000, output_dim = 32) %>%
layer_lstm(units = 500, dropout = 0.25, recurrent_dropout = 0.25, return_sequences = FALSE) %>%
layer_dense(units = 1, activation = "sigmoid")
model_lstm %>% compile(
optimizer = "adam",
loss = "binary_crossentropy",
metrics = "accuracy"
)
summary(model_lstm)
Model: "sequential_5"
_________________________________________________________________________________________________
Layer (type) Output Shape Param #
=================================================================================================
embedding_4 (Embedding) (None, None, 32) 320000
_________________________________________________________________________________________________
lstm (LSTM) (None, 500) 1066000
_________________________________________________________________________________________________
dense_4 (Dense) (None, 1) 501
=================================================================================================
Total params: 1,386,501
Trainable params: 1,386,501
Non-trainable params: 0
_________________________________________________________________________________________________
Lets run it!
history_lstm <- model_lstm %>% fit(
x_train,
y_train,
epochs = 5,
batch_size = 512,
validation_split = 0.25
)
And lets take a look how the accuracy and loss developed over the epocs.
plot(history_lstm)
Well… that takes forever. In this case, we also not exprience any particulr performance benefits… sadly we waited in vain this time… :( To be fair, we see the accuracy still improving, so if we might wait a it…. who knows…
In case you have the GPU version of keras installed, you can actually get some real benefits if you use the layer_cudnn_gru()
instead of the layer_simple_rnn()
, and the layer_cudnn_lstm()
instead of the layer_lstm
. Both are optimized for CUDA parallel processing on the GPU, and speed up the whole story quite a bit. Both can also be used on colab, since there is the GPU available.
[^1] Yoshua Bengio, Patrice Simard, and Paolo Frasconi, “Learning Long-Term Dependencies with Gradient Descent Is Difficult,” IEEE Transactions on Neural Networks 5, no. 2 (1994).
[^2] Sepp Hochreiter and Jürgen Schmidhuber, “Long Short-Term Memory,” Neural Computation 9, no. 8 (1997).
sessionInfo()