102 lines
3.1 KiB
Python
102 lines
3.1 KiB
Python
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#!/usr/bin/env python3
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from optim_nn import *
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#np.random.seed(42069)
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# train loss: 4.194040e-02
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# train accuracy: 99.46%
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# valid loss: 1.998158e-01
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# valid accuracy: 97.26%
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# TODO: add dropout or something to lessen overfitting
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lr = 0.01
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epochs = 24
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starts = 2
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bs = 100
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mnist_dim = 28
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mnist_classes = 10
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def get_mnist(fn='mnist.npz'):
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import os.path
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if not os.path.exists(fn):
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from keras.datasets import mnist
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from keras.utils.np_utils import to_categorical
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(X_train, y_train), (X_test, y_test) = mnist.load_data()
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X_train = X_train.reshape(X_train.shape[0], 1, mnist_dim, mnist_dim)
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X_test = X_test.reshape(X_test.shape[0], 1, mnist_dim, mnist_dim)
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X_train = X_train.astype('float32') / 255
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X_test = X_test.astype('float32') / 255
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Y_train = to_categorical(y_train, mnist_classes)
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Y_test = to_categorical(y_test, mnist_classes)
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np.savez_compressed(fn,
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X_train=X_train,
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Y_train=Y_train,
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X_test=X_test,
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Y_test=Y_test)
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lament("mnist successfully saved to", fn)
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lament("please re-run this program to continue")
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sys.exit(1)
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with np.load(fn) as f:
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return f['X_train'], f['Y_train'], f['X_test'], f['Y_test']
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inputs, outputs, valid_inputs, valid_outputs = get_mnist()
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x = Input(shape=inputs.shape[1:])
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y = x
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y = y.feed(Reshape(new_shape=(mnist_dim, mnist_dim,)))
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y = y.feed(Denses(4, axis=0, init=init_he_normal))
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y = y.feed(Denses(12, axis=1, init=init_he_normal))
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y = y.feed(Flatten())
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y = y.feed(Dense(y.output_shape[0], init=init_he_normal))
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y = y.feed(Relu())
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y = y.feed(Dense(mnist_classes, init=init_glorot_uniform))
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y = y.feed(Softmax())
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model = Model(x, y, unsafe=True)
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optim = Adam()
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learner = SGDR(optim, epochs=epochs//starts, rate=lr,
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restarts=starts - 1, restart_decay=0.5,
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expando=lambda i:0)
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loss = CategoricalCrossentropy()
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mloss = Accuracy()
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ritual = Ritual(learner=learner, loss=loss, mloss=mloss)
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log('parameters', model.param_count)
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ritual.prepare(model)
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def measure_error():
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def print_error(name, inputs, outputs, comparison=None):
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loss, mloss, _, _ = ritual.test_batched(inputs, outputs, bs, return_losses='both')
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log(name + " loss", "{:12.6e}".format(loss))
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log(name + " accuracy", "{:6.2f}%".format(mloss * 100))
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return loss, mloss
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print_error("train", inputs, outputs)
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print_error("valid", valid_inputs, valid_outputs)
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measure_error()
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while learner.next():
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indices = np.arange(inputs.shape[0])
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np.random.shuffle(indices)
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shuffled_inputs = inputs[indices]
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shuffled_outputs = outputs[indices]
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avg_loss, avg_mloss, _, _ = ritual.train_batched(
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shuffled_inputs, shuffled_outputs,
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batch_size=bs,
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return_losses='both')
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fmt = "rate {:10.8f}, loss {:12.6e}, accuracy {:6.2f}%"
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log("epoch {}".format(learner.epoch + 1),
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fmt.format(learner.rate, avg_loss, avg_mloss * 100))
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measure_error()
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