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# coding: utf-8 | |
## Praktyczny Machine Learning w Pythonie | |
### Czy wszystko jest poprawnie zainstalowane? | |
# In[14]: | |
import matplotlib.pylab as plt # pakiet do rysowania | |
import numpy as np # pakiet do manipulacji macierzami | |
import sklearn # scikit-learn, który będzie podstawowym tematem dzisiejszych warsztatów | |
# In[2]: | |
print np.array([[0, 2, 4], [1, 3, 5]]) # macierz w pakiecie numpy | |
# ### Prosze ściągnąć zbiory danych przed warsztatami (inaczej organizatorzy będą smutni) | |
# In[4]: | |
from sklearn.datasets import fetch_lfw_people, fetch_mldata | |
mnist = fetch_mldata("MNIST original") | |
lfw_people = fetch_lfw_people(min_faces_per_person=70, resize=0.4) | |
# In[12]: | |
#Powinno wyświetlić cyfrę 0 | |
img = mnist.data[0] | |
plt.imshow(img.reshape(28,28), cmap="gray_r") | |
# In[15]: | |
n_samples, h, w = lfw_people.images.shape | |
print("height: %d pixels" % h) # height: 50 pixels | |
print("width: %d pixels" % w) # width: 37 pixels | |
# In[22]: | |
# Powinno wyświetlić twarz Tony Blair :) | |
X = lfw_people.data | |
y = lfw_people.target | |
plt.imshow(X[1].reshape(h,w), cmap=plt.cm.gray) |
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