start exercise 4
parent
1b2bdad76a
commit
584b60c82e
5756
Lösungen_N/AB2.ipynb
5756
Lösungen_N/AB2.ipynb
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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 2,
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"id": "a35b6bf3",
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"metadata": {},
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"outputs": [],
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"source": [
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"import numpy as np"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"id": "ea7529b2",
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"metadata": {},
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"outputs": [],
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"source": [
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"iris = np.loadtxt(\"../supplement_files/iris.csv\",delimiter=',')\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "c3166860",
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"metadata": {},
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"outputs": [],
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"source": [
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"# 4d)\n",
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"\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "8f9a70f7",
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "nnw (3.14.x)",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.14.8"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 5
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}
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@ -0,0 +1,65 @@
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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 # gibt boolsche Liste zurück
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return errors.sum()/Y.size # summiert True als 1 in errors auf
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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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net = self._W @ X
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# b verwenden ...
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net = 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 = 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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Y = Y.astype(float)
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# update _W
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# X.shape = (2,4), T.shape = (1,4), Y.shape = (1,4)
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self._W += eta * (T - Y) @ X.T / N
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# update _b
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self._b -= eta * (T - Y) @ np.ones((1,N)).T / N
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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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input("Press Enter to continue...") # wenn gewünscht ...
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# %%
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# 3f)
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X_AND = np.array([[0,0], [1,0], [0,1], [1,1]]).T
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T_AND = np.array([[0],[0],[0],[1]]).T
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sln = SLN(2, 1)
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sln.DeltaTrain(X_AND, T_AND,0.5,10,0)
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# %%
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@ -7,8 +7,8 @@ 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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errors=Y!=T # gibt boolsche Liste zurück
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return errors.sum()/Y.size # summiert True als 1 in errors auf
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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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@ -24,37 +24,45 @@ class SLN:
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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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for n in range(N):
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for j in range(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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net[n]+= X[j,n] * self._W[0, j]
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# b verwenden ...
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net += self._b
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net = 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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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 = 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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Y = Y.astype(float)
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# update _W
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# X.shape = (2,4), T.shape = (1,4), Y.shape = (1,4)
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self._W += eta * (T - Y) @ X.T / N
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# update _b
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self._b -= eta * (T - Y) @ np.ones((1,N)).T / N
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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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input("Press Enter to continue...") # wenn gewünscht ...
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# %%
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# 3f)
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X_AND = np.array([[0,0], [1,0], [0,1], [1,1]]).T
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T_AND = np.array([[0],[0],[0],[1]]).T
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sln = SLN(2, 1)
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sln.DeltaTrain(X_AND, T_AND,0.5,10,0)
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# %%
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