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elm_notebook.py
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elm_notebook.py
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# -*- coding: utf-8 -*-
# <nbformat>2</nbformat>
# <codecell>
# Demo python notebook for sklearn elm and random_hidden_layer modules
#
# Author: David C. Lambert [dcl -at- panix -dot- com]
# Copyright(c) 2013
# License: Simple BSD
# <codecell>
from time import time
import numpy as np
from pylab import plot, hist, mean, std, scatter
from sklearn.cluster import k_means
from sklearn import pipeline
from sklearn.model_selection import train_test_split
from sklearn.preprocessing import StandardScaler
from sklearn.datasets import load_iris, load_digits, load_diabetes, make_regression
from sklearn.ensemble import RandomForestRegressor
from sklearn.linear_model import LinearRegression
from elm import ELMClassifier, ELMRegressor, GenELMClassifier, GenELMRegressor
from random_layer import RandomLayer, MLPRandomLayer, RBFRandomLayer, GRBFRandomLayer
# <codecell>
def make_toy():
x = np.arange(0.25, 20, 0.1)
y = x * np.cos(x) + 0.5 * np.sqrt(x) * np.random.randn(x.shape[0])
x = x.reshape(-1, 1)
y = y.reshape(-1, 1)
return x, y
# <codecell>
def res_dist(x, y, e, n_runs=100, random_state=None):
x_train, x_test, y_train, y_test = train_test_split(
x, y, test_size=0.4, random_state=random_state)
test_res = []
train_res = []
start_time = time()
for i in range(n_runs):
e.fit(x_train, y_train)
train_res.append(e.score(x_train, y_train))
test_res.append(e.score(x_test, y_test))
if i % (n_runs / 10) == 0:
print("%d" % i, end=' ')
print("\nTime: %.3f secs" % (time() - start_time))
print("Test Min: %.3f Mean: %.3f Max: %.3f SD: %.3f"
% (min(test_res), mean(test_res), max(test_res), std(test_res)))
print("Train Min: %.3f Mean: %.3f Max: %.3f SD: %.3f"
% (min(train_res), mean(train_res), max(train_res), std(train_res)))
print()
return train_res, test_res
# <codecell>
stdsc = StandardScaler()
iris = load_iris()
irx, iry = stdsc.fit_transform(iris.data), iris.target
irx_train, irx_test, iry_train, iry_test = train_test_split(
irx, iry, test_size=0.2)
digits = load_digits()
dgx, dgy = stdsc.fit_transform(digits.data / 16.0), digits.target
dgx_train, dgx_test, dgy_train, dgy_test = train_test_split(
dgx, dgy, test_size=0.2)
diabetes = load_diabetes()
dbx, dby = stdsc.fit_transform(diabetes.data), diabetes.target
dbx_train, dbx_test, dby_train, dby_test = train_test_split(
dbx, dby, test_size=0.2)
mrx, mry = make_regression(n_samples=2000, n_targets=4)
mrx_train, mrx_test, mry_train, mry_test = train_test_split(
mrx, mry, test_size=0.2)
xtoy, ytoy = make_toy()
xtoy, ytoy = stdsc.fit_transform(xtoy), stdsc.fit_transform(ytoy)
xtoy_train, xtoy_test, ytoy_train, ytoy_test = train_test_split(
xtoy, ytoy, test_size=0.2)
plot(xtoy, ytoy)
# <codecell>
# RBFRandomLayer tests
for af in RandomLayer.activation_func_names():
print(af, end=' ')
elmc = ELMClassifier(activation_func=af)
tr, ts = res_dist(irx, iry, elmc, n_runs=200, random_state=0)
# <codecell>
elmc.classes_
# <codecell>
for af in RandomLayer.activation_func_names():
print(af)
elmc = ELMClassifier(activation_func=af, random_state=0)
tr, ts = res_dist(dgx, dgy, elmc, n_runs=100, random_state=0)
# <codecell>
elmc = ELMClassifier(n_hidden=500, activation_func='multiquadric')
tr, ts = res_dist(dgx, dgy, elmc, n_runs=100, random_state=0)
scatter(tr, ts, alpha=0.1, marker='D', c='r')
# <codecell>
elmr = ELMRegressor(random_state=0, activation_func='gaussian', alpha=0.0)
elmr.fit(xtoy_train, ytoy_train)
print(elmr.score(xtoy_train, ytoy_train), elmr.score(xtoy_test, ytoy_test))
plot(xtoy, ytoy, xtoy, elmr.predict(xtoy))
# <codecell>
elmr = pipeline.Pipeline([('rhl', RandomLayer(random_state=0, activation_func='multiquadric')),
('lr', LinearRegression(fit_intercept=False))])
elmr.fit(xtoy_train, ytoy_train)
print(elmr.score(xtoy_train, ytoy_train), elmr.score(xtoy_test, ytoy_test))
plot(xtoy, ytoy, xtoy, elmr.predict(xtoy))
# <codecell>
rhl = RandomLayer(n_hidden=200, alpha=1.0)
elmr = GenELMRegressor(hidden_layer=rhl)
tr, ts = res_dist(mrx, mry, elmr, n_runs=200, random_state=0)
scatter(tr, ts, alpha=0.1, marker='D', c='r')
# <codecell>
rhl = RBFRandomLayer(n_hidden=15, rbf_width=0.8)
elmr = GenELMRegressor(hidden_layer=rhl)
elmr.fit(xtoy_train, ytoy_train)
print(elmr.score(xtoy_train, ytoy_train), elmr.score(xtoy_test, ytoy_test))
plot(xtoy, ytoy, xtoy, elmr.predict(xtoy))
# <codecell>
nh = 15
(ctrs, _, _) = k_means(xtoy_train, nh)
unit_rs = np.ones(nh)
#rhl = RBFRandomLayer(n_hidden=nh, activation_func='inv_multiquadric')
#rhl = RBFRandomLayer(n_hidden=nh, centers=ctrs, radii=unit_rs)
rhl = GRBFRandomLayer(n_hidden=nh, grbf_lambda=.0001, centers=ctrs)
elmr = GenELMRegressor(hidden_layer=rhl)
elmr.fit(xtoy_train, ytoy_train)
print(elmr.score(xtoy_train, ytoy_train), elmr.score(xtoy_test, ytoy_test))
plot(xtoy, ytoy, xtoy, elmr.predict(xtoy))
# <codecell>
rbf_rhl = RBFRandomLayer(n_hidden=100, random_state=0, rbf_width=0.01)
elmc_rbf = GenELMClassifier(hidden_layer=rbf_rhl)
elmc_rbf.fit(dgx_train, dgy_train)
print(elmc_rbf.score(dgx_train, dgy_train), elmc_rbf.score(dgx_test, dgy_test))
def powtanh_xfer(activations, power=1.0):
return pow(np.tanh(activations), power)
tanh_rhl = MLPRandomLayer(
n_hidden=100, activation_func=powtanh_xfer, activation_args={'power': 3.0})
elmc_tanh = GenELMClassifier(hidden_layer=tanh_rhl)
elmc_tanh.fit(dgx_train, dgy_train)
print(elmc_tanh.score(dgx_train, dgy_train),
elmc_tanh.score(dgx_test, dgy_test))
# <codecell>
rbf_rhl = RBFRandomLayer(n_hidden=100, rbf_width=0.01)
tr, ts = res_dist(dgx, dgy, GenELMClassifier(
hidden_layer=rbf_rhl), n_runs=100, random_state=0)
# <codecell>
hist(ts), hist(tr)
print()
# <codecell>
tr, ts = res_dist(dbx, dby, RandomForestRegressor(
n_estimators=15), n_runs=100, random_state=0)
hist(tr), hist(ts)
print()
rhl = RBFRandomLayer(n_hidden=15, rbf_width=0.1)
tr, ts = res_dist(dbx, dby, GenELMRegressor(rhl), n_runs=100, random_state=0)
hist(tr), hist(ts)
print()
# <codecell>
elmc = ELMClassifier(
n_hidden=1000, activation_func='gaussian', alpha=0.0, random_state=0)
elmc.fit(dgx_train, dgy_train)
print(elmc.score(dgx_train, dgy_train), elmc.score(dgx_test, dgy_test))
# <codecell>
elmc = ELMClassifier(n_hidden=500, activation_func='hardlim',
alpha=1.0, random_state=0)
elmc.fit(dgx_train, dgy_train)
print(elmc.score(dgx_train, dgy_train), elmc.score(dgx_test, dgy_test))
# <codecell>
elmr = ELMRegressor(random_state=0)
elmr.fit(xtoy_train, ytoy_train)
print(elmr.score(xtoy_train, ytoy_train), elmr.score(xtoy_test, ytoy_test))
plot(xtoy, ytoy, xtoy, elmr.predict(xtoy))
# <codecell>
elmr = ELMRegressor(activation_func='inv_tribas', random_state=0)
elmr.fit(xtoy_train, ytoy_train)
print(elmr.score(xtoy_train, ytoy_train), elmr.score(xtoy_test, ytoy_test))
plot(xtoy, ytoy, xtoy, elmr.predict(xtoy))