Datasets:
HenryAI
/
KerasBERTv1-Data

Dataset card Data Studio Files Community
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inputs = keras.Input(shape=(32, 32, 3), name="img")
x = layers.Conv2D(32, 3, activation="relu")(inputs)
x = layers.Conv2D(64, 3, activation="relu")(x)
block_1_output = layers.MaxPooling2D(3)(x)
x = layers.Conv2D(64, 3, activation="relu", padding="same")(block_1_output)
x = layers.Conv2D(64, 3, activation="relu", padding="same")(x)
block_2_output = layers.add([x, block_1_output])
x = layers.Conv2D(64, 3, activation="relu", padding="same")(block_2_output)
x = layers.Conv2D(64, 3, activation="relu", padding="same")(x)
block_3_output = layers.add([x, block_2_output])
x = layers.Conv2D(64, 3, activation="relu")(block_3_output)
x = layers.GlobalAveragePooling2D()(x)
x = layers.Dense(256, activation="relu")(x)
x = layers.Dropout(0.5)(x)
outputs = layers.Dense(10)(x)
model = keras.Model(inputs, outputs, name="toy_resnet")
model.summary()
Model: "toy_resnet"
__________________________________________________________________________________________________
Layer (type) Output Shape Param # Connected to
==================================================================================================
img (InputLayer) [(None, 32, 32, 3)] 0
__________________________________________________________________________________________________
conv2d_8 (Conv2D) (None, 30, 30, 32) 896 img[0][0]
__________________________________________________________________________________________________
conv2d_9 (Conv2D) (None, 28, 28, 64) 18496 conv2d_8[0][0]
__________________________________________________________________________________________________
max_pooling2d_2 (MaxPooling2D) (None, 9, 9, 64) 0 conv2d_9[0][0]
__________________________________________________________________________________________________
conv2d_10 (Conv2D) (None, 9, 9, 64) 36928 max_pooling2d_2[0][0]
__________________________________________________________________________________________________
conv2d_11 (Conv2D) (None, 9, 9, 64) 36928 conv2d_10[0][0]
__________________________________________________________________________________________________
add (Add) (None, 9, 9, 64) 0 conv2d_11[0][0]
max_pooling2d_2[0][0]
__________________________________________________________________________________________________
conv2d_12 (Conv2D) (None, 9, 9, 64) 36928 add[0][0]
__________________________________________________________________________________________________
conv2d_13 (Conv2D) (None, 9, 9, 64) 36928 conv2d_12[0][0]
__________________________________________________________________________________________________
add_1 (Add) (None, 9, 9, 64) 0 conv2d_13[0][0]
add[0][0]
__________________________________________________________________________________________________
conv2d_14 (Conv2D) (None, 7, 7, 64) 36928 add_1[0][0]
__________________________________________________________________________________________________
global_average_pooling2d (Globa (None, 64) 0 conv2d_14[0][0]
__________________________________________________________________________________________________
dense_6 (Dense) (None, 256) 16640 global_average_pooling2d[0][0]
__________________________________________________________________________________________________
dropout (Dropout) (None, 256) 0 dense_6[0][0]
__________________________________________________________________________________________________
dense_7 (Dense) (None, 10) 2570 dropout[0][0]
==================================================================================================
Total params: 223,242
Trainable params: 223,242
Non-trainable params: 0
__________________________________________________________________________________________________
Plot the model:
keras.utils.plot_model(model, "mini_resnet.png", show_shapes=True)
png
Now train the model:
(x_train, y_train), (x_test, y_test) = keras.datasets.cifar10.load_data()
x_train = x_train.astype("float32") / 255.0
x_test = x_test.astype("float32") / 255.0
y_train = keras.utils.to_categorical(y_train, 10)
y_test = keras.utils.to_categorical(y_test, 10)
model.compile(
optimizer=keras.optimizers.RMSprop(1e-3),
loss=keras.losses.CategoricalCrossentropy(from_logits=True),
metrics=["acc"],
)
# We restrict the data to the first 1000 samples so as to limit execution time
# on Colab. Try to train on the entire dataset until convergence!
model.fit(x_train[:1000], y_train[:1000], batch_size=64, epochs=1, validation_split=0.2)
13/13 [==============================] - 2s 103ms/step - loss: 2.3218 - acc: 0.1291 - val_loss: 2.3014 - val_acc: 0.1150
<tensorflow.python.keras.callbacks.History at 0x157848990>
Shared layers
Another good use for the functional API are models that use shared layers. Shared layers are layer instances that are reused multiple times in the same model -- they learn features that correspond to multiple paths in the graph-of-layers.
Shared layers are often used to encode inputs from similar spaces (say, two different pieces of text that feature similar vocabulary). They enable sharing of information across these different inputs, and they make it possible to train such a model on less data. If a given word is seen in one of the inputs, that will benefit the processing of all inputs that pass through the shared layer.
To share a layer in the functional API, call the same layer instance multiple times. For instance, here's an Embedding layer shared across two different text inputs:
# Embedding for 1000 unique words mapped to 128-dimensional vectors
shared_embedding = layers.Embedding(1000, 128)
# Variable-length sequence of integers
text_input_a = keras.Input(shape=(None,), dtype="int32")
# Variable-length sequence of integers