Removing Conda references.

Author: AlannaBurke

docs/source/training_references.rst

@@ -21,7 +21,10 @@ In general, these scripts rely on the latest (not yet released) pytorch version
 or the latest torchvision version. This means that to use them, **you might need
 to install the latest pytorch and torchvision versions**, with e.g.::
 
-    conda install pytorch torchvision -c pytorch-nightly
+
+.. code-block:: sh
+    pip install torch torchvision
+
 
 If you need to rely on an older stable version of pytorch or torchvision, e.g.
 torchvision 0.10, then it's safer to use the scripts from that corresponding