jupyter notebook中调用.ipynb文件
1、添加jupyter notebook解析文件
首先，创建一个python文件，命名为Ipynb_importer.ipynb，直接粘贴下面的代码。
import io, os,sys,types
from IPython import get_ipython
from nbformat import read
from IPython.core.interactiveshell import InteractiveShell
class NotebookFinder(object):
"""Module finder that locates Jupyter Notebooks"""
def __init__(self):
self.loaders = {}
def find_module(self, fullname, path=None):
nb_path = find_notebook(fullname, path)
if not nb_path:
return
key = path
if path:
# lists aren't hashable
key = os.path.sep.join(path)
if key not in self.loaders:
self.loaders[key] = NotebookLoader(path)
return self.loaders[key]
def find_notebook(fullname, path=None):
"""find a notebook, given its fully qualified name and an optional path
This turns "foo.bar" into "foo/bar.ipynb"
and tries turning "Foo_Bar" into "Foo Bar" if Foo_Bar
does not exist.
"""
name = fullname.rsplit('.', 1)[-1]
if not path:
path = ['']
for d in path:
nb_path = os.path.join(d, name + ".ipynb")
if os.path.isfile(nb_path):
return nb_path
# let import Notebook_Name find "Notebook Name.ipynb"
nb_path = nb_path.replace("_", " ")
if os.path.isfile(nb_path):
return nb_path
class NotebookLoader(object):
"""Module Loader for Jupyter Notebooks"""
def __init__(self, path=None):
self.shell = InteractiveShell.instance()
self.path = path
def load_module(self, fullname):
"""import a notebook as a module"""
path = find_notebook(fullname, self.path)
print ("importing Jupyter notebook from %s" % path)
# load the notebook object
with io.open(path, 'r', encoding='utf-8') as f:
nb = read(f, 4)
# create the module and add it to sys.modules
# if name in sys.modules:
# return sys.modules[name]
mod = types.ModuleType(fullname)
mod.__file__ = path
mod.__loader__ = self
mod.__dict__['get_ipython'] = get_ipython
sys.modules[fullname] = mod
# extra work to ensure that magics that would affect the user_ns
# actually affect the notebook module's ns
save_user_ns = self.shell.user_ns
self.shell.user_ns = mod.__dict__
try:
for cell in nb.cells:
if cell.cell_type == 'code':
# transform the input to executable Python
code = self.shell.input_transformer_manager.transform_cell(cell.source)
# run the code in themodule
exec(code, mod.__dict__)
finally:
self.shell.user_ns = save_user_ns
return mod
sys.meta_path.append(NotebookFinder())
2、调用jupyter notebook module
只要在我们的工作目录下放置Ipynb_importer.ipynb文件，就可以正常调用所有的jupyter notebook文件。 这种方法的本质就是使用一个jupyter notenook解析器先对.ipynb文件进行解析，把文件内的各个模块加载到内存里供其他python文件调用。
新建一个.ipynb文件，里面定义要调用的函数，命名为until5.ipynb (注明：以下是用梯度下降算法求解线性回归)。
def error_function(theta, X, y):
'''Error function J definition.'''
diff = np.dot(X, theta) - y
return (1/2*m) * np.dot(np.transpose(diff), diff)
def gradient_function(theta, X, y):
'''Gradient of the function J definition.'''
diff = np.dot(X, theta) - y
return (1/m) * np.dot(np.transpose(X), diff)
def gradient_descent(X, y, alpha):
'''Perform gradient descent.'''
theta = np.array([1, 1]).reshape(2, 1)
gradient = gradient_function(theta, X, y)
while not np.all(np.absolute(gradient) <= 1e-5):
theta = theta - alpha * gradient
gradient = gradient_function(theta, X, y)
return theta再新建另一个.ipynb主文件，该文件调用untiled5.ipynb文件中的gradient_descent函数和error_function函数
import numpy as np
# Size of the points dataset.
m = 20
# Points x-coordinate and dummy value (x0, x1).
X0 = np.ones((m, 1))
X1 = np.arange(1, m+1).reshape(m, 1)
X = np.hstack((X0, X1))
# Points y-coordinate
y = np.array([
3, 4, 5, 5, 2, 4, 7, 8, 11, 8, 12,
11, 13, 13, 16, 17, 18, 17, 19, 21
]).reshape(m, 1)
# The Learning Rate alpha.
alpha = 0.01
import Ipynb_importer
import Untitled5
optimal = Untitled5.gradient_descent(X, y, alpha)
print('optimal:', optimal)
print('error function:', Untitled5.error_function(optimal, X, y)[0,0])