übung 3
parent
c978f95588
commit
21bdd9376a
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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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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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class SLN:
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def __init__(self, dIn, cOut):
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self.dIn = dIn
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self.cOut = cOut
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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(dIn, cOut) / 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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value = 0
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for i in range(self.dIn):
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value += X[i, n] * self._W[i][0]
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net[n] += value
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return net > self._b[0]
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def delta_train(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 = self.neuron(X) # nur ein Aufruf
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err = ErrorRate(Y, T)
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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(X, T, self.neuron)
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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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for n in range(N):
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error = T[n] - Y[n]
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for j in range(self.dIn):
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weighted_error = error * X[j, n]
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to_learn = weighted_error * eta
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self._W[j, 0] += to_learn
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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(X, T, self.neuron)
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plt.pause(0.05) # warte auf GUI event loop (je nach python Version notwendig oder nicht)
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@ -1,43 +0,0 @@
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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__(...): # Konstruktor
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np.random.seed(42)
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self._b=np.zeros((AAA,1))
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self._W=np.random.randn(BBB,CCC)/np.sqrt(DDD)
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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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