def setup(self, X, num_centers, alpha, save_to='dec_model'): sep = X.shape[0]*9/10 X_train = X[:sep] X_val = X[sep:] ae_model = AutoEncoderModel(self.xpu, [X.shape[1],500,500,2000,10], pt_dropout=0.2) if not os.path.exists(save_to+'_pt.arg'): ae_model.layerwise_pretrain(X_train, 256, 50000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1)) ae_model.finetune(X_train, 256, 100000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1)) ae_model.save(save_to+'_pt.arg') logging.log(logging.INFO, "Autoencoder Training error: %f"%ae_model.eval(X_train)) logging.log(logging.INFO, "Autoencoder Validation error: %f"%ae_model.eval(X_val)) else: ae_model.load(save_to+'_pt.arg') self.ae_model = ae_model self.dec_op = DECModel.DECLoss(num_centers, alpha) label = mx.sym.Variable('label') self.feature = self.ae_model.encoder self.loss = self.dec_op(data=self.ae_model.encoder, label=label, name='dec') self.args.update({k:v for k,v in self.ae_model.args.items() if k in self.ae_model.encoder.list_arguments()}) self.args['dec_mu'] = mx.nd.empty((num_centers, self.ae_model.dims[-1]), ctx=self.xpu) self.args_grad.update({k: mx.nd.empty(v.shape, ctx=self.xpu) for k,v in self.args.items()}) self.args_mult.update({k: k.endswith('bias') and 2.0 or 1.0 for k in self.args}) self.num_centers = num_centers
def setup(self, X, num_centers, alpha, save_to='dec_model'): sep = X.shape[0] * 9 / 10 X_train = X[:sep] X_val = X[sep:] ae_model = AutoEncoderModel(self.xpu, [X.shape[1], 500, 500, 2000, 10], pt_dropout=0.2) if not os.path.exists(save_to + '_pt.arg'): ae_model.layerwise_pretrain(X_train, 256, 50000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000, 0.1)) ae_model.finetune(X_train, 256, 100000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000, 0.1)) ae_model.save(save_to + '_pt.arg') logging.log(logging.INFO, "Autoencoder Training error: %f" % ae_model.eval(X_train)) logging.log(logging.INFO, "Autoencoder Validation error: %f" % ae_model.eval(X_val)) else: ae_model.load(save_to + '_pt.arg') self.ae_model = ae_model self.dec_op = DECModel.DECLoss(num_centers, alpha) label = mx.sym.Variable('label') self.feature = self.ae_model.encoder self.loss = self.dec_op(data=self.ae_model.encoder, label=label, name='dec') self.args.update({k: v for k, v in self.ae_model.args.items() if k in self.ae_model.encoder.list_arguments()}) self.args['dec_mu'] = mx.nd.empty((num_centers, self.ae_model.dims[-1]), ctx=self.xpu) self.args_grad.update({k: mx.nd.empty(v.shape, ctx=self.xpu) for k, v in self.args.items()}) self.args_mult.update({k: k.endswith('bias') and 2.0 or 1.0 for k in self.args}) self.num_centers = num_centers
layers, eval_batch_size, hyperparameters=hyperparameters, pt_dropout=0.2, internal_act='relu', output_act='relu') split_point = int(len(X) * 0.75) train_X = X[:split_point] val_X = X[split_point:] ae_model.layerwise_pretrain(train_X, batch_size, pretrain_num_iter, 'sgd', l_rate=0.001, decay=0.0, lr_scheduler=mx.lr_scheduler.FactorScheduler( 20000, 0.7), print_every=print_every) ae_model.finetune(train_X, batch_size, finetune_num_iter, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.lr_scheduler.FactorScheduler(20000, 0.1), print_every=print_every) ae_model.save('autoencoder.arg')
y_train = YnxG_allNME[1][sep:] batch_size = 125 # 160 32*5 = update_interval*5 allAutoencoders = [] for output_size in latent_size: # Train or Read autoencoder: interested in encoding/decoding the input nxg features into LD latent space # optimized for clustering with DEC xpu = mx.cpu() ae_model = AutoEncoderModel( xpu, [X_train.shape[1], 500, 500, 2000, output_size], pt_dropout=0.2) ## Pre-train ae_model.layerwise_pretrain(X_train, batch_size, 50000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler( 20000, 0.1)) ## finetune ae_model.finetune(X_train, batch_size, 100000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000, 0.1)) ## Get train/valid error (for Generalization) logging.log(logging.INFO, "Autoencoder Training error: %f" % ae_model.eval(X_train))
# pylint: skip-file import mxnet as mx import numpy as np import logging import data from autoencoder import AutoEncoderModel if __name__ == '__main__': # set to INFO to see less information during training logging.basicConfig(level=logging.DEBUG) ae_model = AutoEncoderModel(mx.gpu(0), [784,500,500,2000,10], pt_dropout=0.2, internal_act='relu', output_act='relu') X, _ = data.get_mnist() train_X = X[:60000] val_X = X[60000:] ae_model.layerwise_pretrain(train_X, 256, 50000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1)) ae_model.finetune(train_X, 256, 100000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1)) ae_model.save('mnist_pt.arg') ae_model.load('mnist_pt.arg') print "Training error:", ae_model.eval(train_X) print "Validation error:", ae_model.eval(val_X)
batch_size = opt.batch_size pretrain_num_iter = opt.pretrain_num_iter finetune_num_iter = opt.finetune_num_iter visualize = opt.visualize layers = [int(i) for i in opt.num_units.split(',')] if __name__ == '__main__': ae_model = AutoEncoderModel(mx.cpu(0), layers, pt_dropout=0.2, internal_act='relu', output_act='relu') X, _ = data.get_mnist() train_X = X[:60000] val_X = X[60000:] ae_model.layerwise_pretrain(train_X, batch_size, pretrain_num_iter, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1), print_every=print_every) ae_model.finetune(train_X, batch_size, finetune_num_iter, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1), print_every=print_every) ae_model.save('mnist_pt.arg') ae_model.load('mnist_pt.arg') print("Training error:", ae_model.eval(train_X)) print("Validation error:", ae_model.eval(val_X)) if visualize: try: from matplotlib import pyplot as plt from model import extract_feature # sample a random image original_image = X[np.random.choice(X.shape[0]), :].reshape(1, 784) data_iter = mx.io.NDArrayIter({'data': original_image}, batch_size=1, shuffle=False, last_batch_handle='pad')
import mxnet as mx import numpy as np import logging from autoencoder import AutoEncoderModel if __name__ == '__main__': # set to INFO to see less information during training logging.basicConfig(level=logging.DEBUG) ae_model = AutoEncoderModel(mx.gpu(0), [784,500,500,2000,10], pt_dropout=0.2, internal_act='relu', output_act='relu') X=np.random.rand(100000,784) train_X = X[:60000] val_X = X[60000:] ae_model.layerwise_pretrain(train_X, 256, 50000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1)) ae_model.finetune(train_X, 256, 100000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000,0.1)) ae_model.save('mnist_pt.arg') ae_model.load('mnist_pt.arg') print "Training error:", ae_model.eval(train_X) print "Validation error:", ae_model.eval(val_X)
def setup(self, X, num_centers, alpha, znum, save_to='dec_model'): self.sep = int(X.shape[0] * 0.75) X_train = X[:self.sep] X_val = X[self.sep:] batch_size = 32 # 160 32*5 = update_interval*5 # Train or Read autoencoder: note is not dependent on number of clusters just on z latent size ae_model = AutoEncoderModel(self.xpu, [X.shape[1], 500, 500, 2000, znum], pt_dropout=0.2) if not os.path.exists(save_to + '_pt.arg'): ae_model.layerwise_pretrain(X_train, batch_size, 50000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler( 20000, 0.1)) ae_model.finetune(X_train, batch_size, 100000, 'sgd', l_rate=0.1, decay=0.0, lr_scheduler=mx.misc.FactorScheduler(20000, 0.1)) ae_model.save(save_to + '_pt.arg') logging.log( logging.INFO, "Autoencoder Training error: %f" % ae_model.eval(X_train)) logging.log( logging.INFO, "Autoencoder Validation error: %f" % ae_model.eval(X_val)) else: ae_model.load(save_to + '_pt.arg') logging.log( logging.INFO, "Reading Autoencoder from file..: %s" % (save_to + '_pt.arg')) logging.log( logging.INFO, "Autoencoder Training error: %f" % ae_model.eval(X_train)) logging.log( logging.INFO, "Autoencoder Validation error: %f" % ae_model.eval(X_val)) self.ae_model = ae_model logging.log(logging.INFO, "finished reading Autoencoder from file..: ") # prep model for clustering self.dec_op = DECModel.DECLoss(num_centers, alpha) label = mx.sym.Variable('label') self.feature = self.ae_model.encoder self.loss = self.dec_op(data=self.ae_model.encoder, label=label, name='dec') self.args.update({ k: v for k, v in self.ae_model.args.items() if k in self.ae_model.encoder.list_arguments() }) self.args['dec_mu'] = mx.nd.empty( (num_centers, self.ae_model.dims[-1]), ctx=self.xpu) self.args_grad.update({ k: mx.nd.empty(v.shape, ctx=self.xpu) for k, v in self.args.items() }) self.args_mult.update( {k: k.endswith('bias') and 2.0 or 1.0 for k in self.args}) self.num_centers = num_centers self.znum = znum self.batch_size = batch_size self.G = self.ae_model.eval(X_train) / self.ae_model.eval(X_val)