[MRG] Add logo to POT (#357)

* add logo code and logo to doc

* update release file

8 files changed, 508 insertions, 1 deletions

diff --git a/RELEASES.md b/RELEASES.md
index 18562e7..0f1f231 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -5,6 +5,7 @@
 
 #### New features
 
+- A brand new logo for POT (PR #357)
 - Better list of related examples in quick start guide with `minigallery` (PR #334).
 - Add optional log-domain Sinkhorn implementation in WDA to support smaller values
   of the regularization parameter (PR #336).
diff --git a/docs/source/_static/images/logo.png b/docs/source/_static/images/logo.png
new file mode 100644
index 0000000..7be5df7
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new file mode 100644
index 0000000..0bf2cb7
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diff --git a/docs/source/conf.py b/docs/source/conf.py
index d1b8426..60d0bb7 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -162,6 +162,7 @@ html_theme = 'sphinx_rtd_theme'
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
+
 html_theme_options = {}
 
 # Add any paths that contain custom themes here, relative to this directory.
@@ -176,7 +177,7 @@ html_theme_options = {}
 
 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-#html_logo = None
+html_logo = '_static/images/logo_dark.svg'
 
 # The name of an image file (relative to this directory) to use as a favicon of
 # the docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
@@ -188,6 +189,7 @@ html_theme_options = {}
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['_static']
 
+
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.
diff --git a/docs/source/index.rst b/docs/source/index.rst
index 8de31ae..7ff7d22 100644
--- a/docs/source/index.rst
+++ b/docs/source/index.rst
@@ -6,6 +6,10 @@
 POT: Python Optimal Transport
 =============================
 
+.. image:: _static/images/logo.svg
+  :width: 400
+  :alt: POT Logo
+
 Contents
 --------
 
@@ -20,6 +24,7 @@ Contents
    .github/CONTRIBUTING
    .github/CODE_OF_CONDUCT
 
+
 .. include:: ../../README.md
    :parser: myst_parser.sphinx_
 
diff --git a/examples/others/plot_logo.py b/examples/others/plot_logo.py
new file mode 100644
index 0000000..afddcad
--- /dev/null
+++ b/examples/others/plot_logo.py
@@ -0,0 +1,112 @@
+
+# -*- coding: utf-8 -*-
+r"""
+=======================
+Logo of the POT toolbox
+=======================
+
+In this example we plot the logo of the POT toolbox.
+
+A specificity of this logo is that it is done 100% in Python and generated using
+matplotlib using the EMD solver from POT.
+
+"""
+
+# Author: Remi Flamary <remi.flamary@polytechnique.edu>
+#
+# License: MIT License
+
+# sphinx_gallery_thumbnail_number = 1
+
+# %%
+import numpy as np
+import matplotlib.pyplot as pl
+import ot
+
+# %%
+# Data for logo
+# -------------
+
+
+# Letter P
+p1 = np.array([[0, 6.], [0, 5], [0, 4], [0, 3], [0, 2], [0, 1], ])
+p2 = np.array([[1.5, 6], [2, 4], [2, 5], [1.5, 3], [0.5, 2], [.5, 1], ])
+
+# Letter O
+o1 = np.array([[0, 6.], [-1, 5], [-1.5, 4], [-1.5, 3], [-1, 2], [0, 1], ])
+o2 = np.array([[1, 6.], [2, 5], [2.5, 4], [2.5, 3], [2, 2], [1, 1], ])
+
+# scaling and translation for letter O
+o1[:, 0] += 6.4
+o2[:, 0] += 6.4
+o1[:, 0] *= 0.6
+o2[:, 0] *= 0.6
+
+# letter T
+t1 = np.array([[-1, 6.], [-1, 5], [0, 4], [0, 3], [0, 2], [0, 1], ])
+t2 = np.array([[1.5, 6.], [1.5, 5], [0.5, 4], [0.5, 3], [0.5, 2], [0.5, 1], ])
+
+# translatin the T
+t1[:, 0] += 7.1
+t2[:, 0] += 7.1
+
+# Cocatenate all letters
+x1 = np.concatenate((p1, o1, t1), axis=0)
+x2 = np.concatenate((p2, o2, t2), axis=0)
+
+# Horizontal and vertical scaling
+sx = 1.0
+sy = .5
+x1[:, 0] *= sx
+x1[:, 1] *= sy
+x2[:, 0] *= sx
+x2[:, 1] *= sy
+
+# %%
+# Plot the logo (clear background)
+# --------------------------------
+
+# Solve OT problem between the points
+M = ot.dist(x1, x2, metric='euclidean')
+T = ot.emd([], [], M)
+
+pl.figure(1, (3.5, 1.1))
+pl.clf()
+# plot the OT plan
+for i in range(M.shape[0]):
+    for j in range(M.shape[1]):
+        if T[i, j] > 1e-8:
+            pl.plot([x1[i, 0], x2[j, 0]], [x1[i, 1], x2[j, 1]], color='k', alpha=0.6, linewidth=3, zorder=1)
+# plot the samples
+pl.plot(x1[:, 0], x1[:, 1], 'o', markerfacecolor='C3', markeredgecolor='k')
+pl.plot(x2[:, 0], x2[:, 1], 'o', markerfacecolor='b', markeredgecolor='k')
+
+
+pl.axis('equal')
+pl.axis('off')
+
+# Save logo file
+# pl.savefig('logo.svg', dpi=150, bbox_inches='tight')
+# pl.savefig('logo.png', dpi=150, bbox_inches='tight')
+
+# %%
+# Plot the logo (dark background)
+# --------------------------------
+
+pl.figure(2, (3.5, 1.1), facecolor='darkgray')
+pl.clf()
+# plot the OT plan
+for i in range(M.shape[0]):
+    for j in range(M.shape[1]):
+        if T[i, j] > 1e-8:
+            pl.plot([x1[i, 0], x2[j, 0]], [x1[i, 1], x2[j, 1]], color='w', alpha=0.8, linewidth=3, zorder=1)
+# plot the samples
+pl.plot(x1[:, 0], x1[:, 1], 'o', markerfacecolor='w', markeredgecolor='w')
+pl.plot(x2[:, 0], x2[:, 1], 'o', markerfacecolor='w', markeredgecolor='w')
+
+pl.axis('equal')
+pl.axis('off')
+
+# Save logo file
+# pl.savefig('logo_dark.svg', dpi=150, transparent=True, bbox_inches='tight')
+# pl.savefig('logo_dark.png', dpi=150, transparent=True, bbox_inches='tight')