import numpy as np
import matplotlib.pyplot as plt
import pandas as pd
from pandas import Series, DataFrame
from numpy.random import normal
N=10
M=[0,1,3,9]
def create_dataset(num):
dataset = DataFrame(columns=['x','y'])
for i in range(num):
x = float(i)/float(num-1)
y = np.sin(2*np.pi*x) + normal(scale=0.3)
dataset = dataset.append(Series([x,y], index=['x','y']),
ignore_index=True)
return dataset
def rms_error(dataset, f):
err = 0.0
for index, line in dataset.iterrows():
x, y = line.x, line.y
err += 0.5 * (y - f(x))**2
return np.sqrt(2 * err / len(dataset))
def resolve(dataset, m):
t = dataset.y
phi = DataFrame()
for i in range(0,m+1):
p = dataset.x**i
p.name="x**%d" % i
phi = pd.concat([phi,p], axis=1)
tmp = np.linalg.inv(np.dot(phi.T, phi))
ws = np.dot(np.dot(tmp, phi.T), t)
def f(x):
y = 0
for i, w in enumerate(ws):
y += w * (x ** i)
return y
return (f, ws)
# Main
if __name__ == '__main__':
train_set = create_dataset(N)
test_set = create_dataset(N)
df_ws = DataFrame()
fig = plt.figure()
for c, m in enumerate(M):
f, ws = resolve(train_set, m)
df_ws = df_ws.append(Series(ws,name="M=%d" % m))
subplot = fig.add_subplot(2,2,c+1)
subplot.set_xlim(-0.05,1.05)
subplot.set_ylim(-1.5,1.5)
subplot.set_title("M=%d" % m)
subplot.scatter(train_set.x, train_set.y, marker='o', color='blue')
linex = np.linspace(0,1,101)
liney = np.sin(2*np.pi*linex)
subplot.plot(linex, liney, color='green', linestyle='--')
linex = np.linspace(0,1,101)
liney = f(linex)
label = "E(RMS)=%.2f" % rms_error(train_set, f)
subplot.plot(linex, liney, color='red', label=label)
subplot.legend(loc=1)
print "Table of the coefficients"
print df_ws.transpose()
fig.show()
df = DataFrame(columns=['Training set','Test set'])
for m in range(0,10): # 多項式の次数
f, ws = resolve(train_set, m)
train_error = rms_error(train_set, f)
test_error = rms_error(test_set, f)
df = df.append(
Series([train_error, test_error],
index=['Training set','Test set']),
ignore_index=True)
df.plot(title='RMS Error', style=['-','--'], grid=True, ylim=(0,0.9))
plt.show()
以下のようなエラーがでます。
ImportError Traceback (most recent call last)
/root/ml4se/scripts/02-square_error.py in <module>()
7
8 import numpy as np
----> 9 import matplotlib.pyplot as plt
10 import pandas as pd
11 from pandas import Series, DataFrame
/root/.local/lib/python2.7/site-packages/matplotlib/pyplot.py in <module>()
112
113 from matplotlib.backends import pylab_setup
--> 114 _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
115
116 _IP_REGISTERED = None
/root/.local/lib/python2.7/site-packages/matplotlib/backends/__init__.pyc in pylab_setup()
30 # imports. 0 means only perform absolute imports.
31 backend_mod = __import__(backend_name,
---> 32 globals(),locals(),[backend_name],0)
33
34 # Things we pull in from all backends
/root/.local/lib/python2.7/site-packages/matplotlib/backends/backend_tkagg.py in <module>()
4
5 import six
----> 6 from six.moves import tkinter as Tk
7 from six.moves import tkinter_filedialog as FileDialog
8
/root/.local/lib/python2.7/site-packages/six.pyc in load_module(self, fullname)
201 mod = self.__get_module(fullname)
202 if isinstance(mod, MovedModule):
--> 203 mod = mod._resolve()
204 else:
205 mod.__loader__ = self
/root/.local/lib/python2.7/site-packages/six.pyc in _resolve(self)
113
114 def _resolve(self):
--> 115 return _import_module(self.mod)
116
117 def __getattr__(self, attr):
/root/.local/lib/python2.7/site-packages/six.pyc in _import_module(name)
80 def _import_module(name):
81 """Import module, returning the module after the last dot."""
---> 82 __import__(name)
83 return sys.modules[name]
84
/root/.pyenv/versions/2.7.5/lib/python2.7/lib-tk/Tkinter.py in <module>()
37 # Attempt to configure Tcl/Tk without requiring PATH
38 import FixTk
---> 39 import _tkinter # If this fails your Python may not be configured for Tk
40 tkinter = _tkinter # b/w compat for export
41 TclError = _tkinter.TclError
ImportError: No module named _tkinter
$ pip install ipython
$ ipython
Python 2.7.5 (default, Jul 31 2016, 20:23:56)
Type "copyright", "credits" or "license" for more information.
IPython 5.0.0 -- An enhanced Interactive Python.
? -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help -> Python's own help system.
object? -> Details about 'object', use 'object??' for extra details.
In [1]: import pandas
In [2]: exit
上記に記載しましたが
Tkinterのエラーはでなくなりました。ありがとうございます。
しかし、今度は
ImportError Traceback (most recent call last)
/root/setup/ml4se/scripts/02-square_error.py in <module>()
8 import numpy as np
9 import matplotlib.pyplot as plt
---> 10 import pandas as pd
11 from pandas import Series, DataFrame
12
ImportError: No module named pandas
In [4]: No module named pandas
...: exit
File "<ipython-input-4-442cc5665745>", line 1
No module named pandas
^
SyntaxError: invalid syntax
のエラーがでてうごきません。
すいません。教えてください
import pandasをおこないました
In [2]: import panda
ImportError Traceback (most recent call last)
<ipython-input-2-908607987b94> in <module>()
----> 1 import panda
ImportError: No module named panda
のエラーがでました
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2016/08/02 12:13
2016/08/02 17:05
2016/08/03 10:25