continue exercise 3, not done yet
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# -*- coding: utf-8 -*-
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# %%
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import numpy as np
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import nnwplot
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import matplotlib.pyplot as plt
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# %% ErrorRate
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def ErrorRate(Y,T):
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if Y.ndim==1 or Y.shape[0]==1:
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errors=Y!=T
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return errors.sum()/Y.size
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else: # für mehrere Ausgaben in one-hot Kodierung:
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errors=Y.argmax(0)!=T.argmax(0)
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return errors.sum()/Y.shape[1]
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# %%
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class SLN:
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def __init__(self, dIn, cOut): # Konstruktor
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np.random.seed(42)
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self._b=np.zeros((cOut,1))
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self._W=np.random.randn(cOut,dIn)/np.sqrt(dIn+1)
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def neuron(self, X):
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N = X.shape[1]
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net = np.zeros(N)
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for n in range(0,N):
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for j in range(0,X.shape[0]):
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# print(self._W)
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net[n]+= X[j,n] * self._W[j]
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# b verwenden ...
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net += self._b
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return net > 0 # threshold ....
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# def DeltaTrain(self, X, T, eta, maxIter, maxErrorRate):
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# N=X.shape[1] # Anzahl Trainingsdaten
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# plt.ion() # interactive mode on
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# for it in range(maxIter):
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# Y = ... # nur ein Aufruf
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# err = ErrorRate(..., ...)
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# if (it%20) == 0:
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# print('#{} err:{}\n{}\n{}'.format(it,err,self._W,self._b))
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# nnwplot.plotTwoFeatures(...)
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# plt.pause(0.05) # warte auf GUI event loop (je nach python Version notwendig oder nicht)
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# if err <= maxErrorRate:
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# break
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# # update _W
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# ...
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# # update _b
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# ...
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# print('#{} err:{}\n{}\n{}'.format(it,err,self._W,self._b))
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# nnwplot.plotTwoFeatures(...)
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# plt.pause(0.05) # warte auf GUI event loop (je nach python Version notwendig oder nicht)
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#
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# input("Press Enter to continue...") # wenn gewünscht ...
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# %%
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# %%
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@ -6,25 +6,29 @@ import numpy as np
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import nnwplot
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def neuron(X):
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N = X.shape[...]
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N = X.shape[1]
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net = np.zeros(N)
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W = [....]
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b = # Bias ... ergibt sich aus Aktivierungsschwelle
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W = [-0.3,1]
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b = 2 # Bias ... ergibt sich aus Aktivierungsschwelle
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for n in range(0,N):
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for j in range ...:
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net[..]+=
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b verwenden ...
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return net ... # threshold ....
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for j in range(0,X.shape[0]):
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net[n]+= X[n,j] * W[j]
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# b verwenden ...
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return net > b # threshold ....
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#%%
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iris = np.loadtxt("iris.csv",delimiter=',')
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X=iris[...]
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T=iris[...]
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# X=iris[:,:2].T # nur die ersten 2 Merkmale anschauen und in Spaltenvektoren umwandeln
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T=iris[-1]
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print(X)
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print(T)
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# print(X)
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# print(T)
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print(X.shape[0])
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neuron(X)
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#%%
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# AG1b
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nnwplot.plotTwoFeatures(X[...], T, neuron)
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# %%
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