Feature/manifold mixup (#644)

* Add manifold mixup

* Update and cite

* Fix bug

* Update

* Update readme

CHANGELOG.md

@@ -7,7 +7,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 ### Added
 - Added BCPlus callback for between-class learning
 - Added support for PyTorch 1.3
-- Added a show flag to the `ImagingCallback.to_pyplot` method, set to false to stop it from calling `plt.show` 
+- Added a show flag to the `ImagingCallback.to_pyplot` method, set to false to stop it from calling `plt.show`
+- Added manifold mixup  
 ### Changed
 - Changed the default behaviour of `ImagingCallback.to_pyplot` to turn off the axis
 ### Deprecated

README.md

@@ -407,7 +407,7 @@ A PyTorch model fitting library designed for use by researchers (or anyone reall
             </a>
         </td>
     </tr>
-    <tr>
+        <tr>
         <td align="center">
             <a href="https://github.com/pytorchbearer/torchbearer/blob/master/docs/_static/notebooks/regularisers.ipynb">
                 <img src="http://www.pytorchbearer.org/assets/img/github_logo.png" height="32">
@@ -421,6 +421,30 @@ A PyTorch model fitting library designed for use by researchers (or anyone reall
             </a>
         </td>
     </tr>
+    <tr>
+        <td rowspan="3" colspan="2">
+            <b>Manifold Mixup:</b> A demonstration of how to use the Manifold Mixup callback in Torchbearer.
+        </td>
+        <td align="center">
+            <a href="https://nbviewer.jupyter.org/github/pytorchbearer/torchbearer/blob/master/docs/_static/notebooks/manifold_mixup.ipynb">
+                <img src="http://www.pytorchbearer.org/assets/img/nbviewer_logo.svg" height="34">
+            </a>
+        </td>
+    </tr>
+    <tr>
+        <td align="center">
+            <a href="https://github.com/pytorchbearer/torchbearer/blob/master/docs/_static/notebooks/manifold_mixup.ipynb">
+                <img src="http://www.pytorchbearer.org/assets/img/github_logo.png" height="32">
+            </a>
+        </td>
+    </tr>
+    <tr>
+        <td align="center">
+            <a href="https://colab.research.google.com/github/pytorchbearer/torchbearer/blob/master/docs/_static/notebooks/manifold_mixup.ipynb">
+                <img src="http://www.pytorchbearer.org/assets/img/colab_logo.png" height="28">
+            </a>
+        </td>
+    </tr>
     <tr>
         <td rowspan="3">
             <img src="http://www.pytorchbearer.org/assets/img/examples/cam.jpg" width="256">