Merge branch 'master' into nn_refactor

Author: naspert

.zenodo.json

@@ -0,0 +1,39 @@
+{
+	"title": "PyGSP: Graph Signal Processing in Python",
+	"description": "The PyGSP facilitates a wide variety of operations on graphs, like computing their Fourier basis, filtering or interpolating signals, plotting graphs, signals, and filters.",
+	"upload_type": "software",
+	"license": "BSD-3-Clause",
+	"access_right": "open",
+	"creators": [
+		{
+			"name": "Micha\u00ebl Defferrard",
+			"affiliation": "EPFL",
+			"orcid": "0000-0002-6028-9024"
+		},
+		{
+			"name": "Lionel Martin",
+			"affiliation": "EPFL"
+		},
+		{
+			"name": "Rodrigo Pena",
+			"affiliation": "EPFL"
+		},
+		{
+			"name": "Nathana\u00ebl Perraudin",
+			"affiliation": "EPFL",
+			"orcid": "0000-0001-8285-1308"
+		}
+	],
+	"related_identifiers": [
+		{
+			"scheme": "url",
+			"identifier": "https://github.com/epfl-lts2/pygsp",
+			"relation": "isSupplementTo"
+		},
+		{
+			"scheme": "doi",
+			"identifier": "10.5281/zenodo.1003157",
+			"relation": "isPartOf"
+		}
+	]
+}

CONTRIBUTING.rst

@@ -57,6 +57,9 @@ Making a release
 
    Log in as the LTS2 user.
 #. Build and upload the distribution to the real PyPI with ``make release``.
+#. Update the conda feedstock (at least the version number and sha256 in
+   ``recipe/meta.yaml``) by sending a PR to
+   `conda-forge <https://github.com/conda-forge/pygsp-feedstock>`_.
 
 Repository organization
 -----------------------

README.rst

@@ -14,7 +14,7 @@ PyGSP: Graph Signal Processing in Python
    :target: https://pygsp.readthedocs.io
 .. |pypi| image:: https://img.shields.io/pypi/v/pygsp.svg
    :target: https://pypi.python.org/pypi/PyGSP
-.. |zenodo| image:: https://zenodo.org/badge/16276560.svg
+.. |zenodo| image:: https://zenodo.org/badge/DOI/10.5281/zenodo.1003157.svg
    :target: https://doi.org/10.5281/zenodo.1003157
 .. |license| image:: https://img.shields.io/pypi/l/pygsp.svg
    :target: https://github.com/epfl-lts2/pygsp/blob/master/LICENSE.txt
@@ -33,13 +33,11 @@ PyGSP: Graph Signal Processing in Python
 
 The PyGSP is a Python package to ease
 `Signal Processing on Graphs <https://arxiv.org/abs/1211.0053>`_.
-It is a free software, distributed under the BSD license, and
-available on `PyPI <https://pypi.python.org/pypi/PyGSP>`_.
 The documentation is available on
 `Read the Docs <https://pygsp.readthedocs.io>`_
 and development takes place on
 `GitHub <https://github.com/epfl-lts2/pygsp>`_.
-(A `Matlab counterpart <https://epfl-lts2.github.io/gspbox-html>`_ exists.)
+A (mostly unmaintained) `Matlab version <https://epfl-lts2.github.io/gspbox-html>`_ exists.
 
 The PyGSP facilitates a wide variety of operations on graphs, like computing
 their Fourier basis, filtering or interpolating signals, plotting graphs,
@@ -60,8 +58,15 @@ main objects of the package.
 
 >>> from pygsp import graphs, filters
 >>> G = graphs.Logo()
->>> G.estimate_lmax()
->>> g = filters.Heat(G, tau=100)
+>>> G.compute_fourier_basis()  # Fourier to plot the eigenvalues.
+>>> # G.estimate_lmax() is otherwise sufficient.
+>>> g = filters.Heat(G, tau=50)
+>>> g.plot()
+
+.. image:: ../pygsp/data/readme_example_filter.png
+    :alt:
+.. image:: pygsp/data/readme_example_filter.png
+    :alt:
 
 Let's now create a graph signal: a set of three Kronecker deltas for that
 example. We can now look at one step of heat diffusion by filtering the deltas
@@ -73,11 +78,11 @@ structure!
 >>> s = np.zeros(G.N)
 >>> s[DELTAS] = 1
 >>> s = g.filter(s)
->>> G.plot_signal(s, highlight=DELTAS, backend='matplotlib')
+>>> G.plot_signal(s, highlight=DELTAS)
 
-.. image:: ../pygsp/data/readme_example.png
+.. image:: ../pygsp/data/readme_example_graph.png
     :alt:
-.. image:: pygsp/data/readme_example.png
+.. image:: pygsp/data/readme_example_graph.png
     :alt:
 
 You can
@@ -86,7 +91,7 @@ look at the
 `tutorials <https://pygsp.readthedocs.io/en/stable/tutorials/index.html>`_
 to learn how to use it, or look at the
 `reference guide <https://pygsp.readthedocs.io/en/stable/reference/index.html>`_
-for an exhaustive documentation of the API. Enjoy the package!
+for an exhaustive documentation of the API. Enjoy!
 
 Installation
 ------------
@@ -115,6 +120,16 @@ research purpose at the `EPFL LTS2 laboratory <https://lts2.epfl.ch>`_.
 This project has been partly funded by the Swiss National Science Foundation
 under grant 200021_154350 "Towards Signal Processing on Graphs".
 
+The code in this repository is released under the terms of the `BSD 3-Clause license <LICENSE.txt>`_.
+
 If you are using the library for your research, for the sake of
 reproducibility, please cite the version you used as indexed by
 `Zenodo <https://doi.org/10.5281/zenodo.1003157>`_.
+Or cite the generic concept as::
+
+    @misc{pygsp,
+      title = {PyGSP: Graph Signal Processing in Python},
+      author = {Defferrard, Micha\"el and Martin, Lionel and Pena, Rodrigo and Perraudin, Nathana\"el},
+      doi = {10.5281/zenodo.1003157},
+      url = {https://github.com/epfl-lts2/pygsp/},
+    }

pygsp/data/readme_example_filter.png

@@ -40,7 +40,7 @@ class Abspline(Filter):
 
     """
 
-    def __init__(self, G, Nf=6, lpfactor=20, scales=None, **kwargs):
+    def __init__(self, G, Nf=6, lpfactor=20, scales=None):
 
         def kernel_abspline3(x, alpha, beta, t1, t2):
             M = np.array([[1, t1, t1**2, t1**3],
@@ -98,4 +98,4 @@ def kernel_abspline3(x, alpha, beta, t1, t2):
         lminfac = .6 * G.lmin
         g[0] = lambda x: gamma_l * gl(x / lminfac)
 
-        super(Abspline, self).__init__(G, g, **kwargs)
+        super(Abspline, self).__init__(G, g)

pygsp/data/readme_example.png renamed to pygsp/data/readme_example_graph.png

@@ -33,7 +33,7 @@ class Expwin(Filter):
 
     """
 
-    def __init__(self, G, bmax=0.2, a=1., **kwargs):
+    def __init__(self, G, bmax=0.2, a=1.):
 
         def fx(x, a):
             y = np.exp(-float(a)/x)
@@ -53,4 +53,4 @@ def ffin(x, a):
 
         g = [lambda x: ffin(np.float64(x)/bmax/G.lmax, a)]
 
-        super(Expwin, self).__init__(G, g, **kwargs)
+        super(Expwin, self).__init__(G, g)

pygsp/filters/abspline.py

@@ -31,10 +31,6 @@ class Filter(object):
     G : Graph
         The graph to which the filter bank was tailored. It is a reference to
         the graph passed when instantiating the class.
-    kernels : function or list of functions
-        A (list of) function defining the filter bank. One function per filter.
-        Either passed by the user when instantiating the base class, either
-        constructed by the derived classes.
     Nf : int
         Number of filters in the filter bank.
 
@@ -93,8 +89,8 @@ def evaluate(self, x):
         """
         # Avoid to copy data as with np.array([g(x) for g in self._kernels]).
         y = np.empty((self.Nf, len(x)))
-        for i, g in enumerate(self._kernels):
-            y[i] = g(x)
+        for i, kernel in enumerate(self._kernels):
+            y[i] = kernel(x)
         return y
 
     def filter(self, s, method='chebyshev', order=30):

pygsp/filters/expwin.py

@@ -31,7 +31,7 @@ class HalfCosine(Filter):
 
     """
 
-    def __init__(self, G, Nf=6, **kwargs):
+    def __init__(self, G, Nf=6):
 
         if Nf <= 2:
             raise ValueError('The number of filters must be higher than 2.')
@@ -45,4 +45,4 @@ def __init__(self, G, Nf=6, **kwargs):
         for i in range(Nf):
             g.append(lambda x, ind=i: main_window(x - dila_fact/3. * (ind - 2)))
 
-        super(HalfCosine, self).__init__(G, g, **kwargs)
+        super(HalfCosine, self).__init__(G, g)

pygsp/filters/filter.py

@@ -61,7 +61,7 @@ class Heat(Filter):
 
     """
 
-    def __init__(self, G, tau=10, normalize=False, **kwargs):
+    def __init__(self, G, tau=10, normalize=False):
 
         try:
             iter(tau)
@@ -76,4 +76,4 @@ def kernel(x, t):
             norm = np.linalg.norm(kernel(G.e, t)) if normalize else 1
             g.append(lambda x, t=t, norm=norm: kernel(x, t) / norm)
 
-        super(Heat, self).__init__(G, g, **kwargs)
+        super(Heat, self).__init__(G, g)