adding links to tutorials repo for tf2 docs

Summary: TF2.4 only

Reviewers: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, georgep, arsalanu

Reviewed By: #tensorflow, #framework_ip_review_-_any_oss_or_third-party_code_use_has_been_approved, georgep

Subscribers: louisev, georgep

Maniphest Tasks: T33246

Differential Revision: https://phabricator.sourcevertex.net/D52042

Author: arsalanu

tensorflow/compiler/plugin/poplar/docs/keras_tf2.rst

@@ -6,6 +6,9 @@ Keras model creation is no different than what you would use if you were
 training on other devices. To target the Poplar XLA device, Keras model creation
 must be inside the ``strategy.scope`` of an ``IPUStrategy``.
 
+For a more practical walkthrough, see `this tutorial about using Keras on the IPU <https://github.com/graphcore/tutorials/tree/sdk-release-2.3/tutorials/tensorflow2/keras>`_
+from the Graphcore tutorials repository.
+
 Single IPU models
 ~~~~~~~~~~~~~~~~~
 

tensorflow/compiler/plugin/poplar/docs/perf_training.rst

@@ -98,6 +98,9 @@ array and will contain `x1 - x2` for each iteration in the loop.
 
 See entries in the :ref:`api-section` for more details.
 
+For a more practical example, the Graphcore tutorials repository contains a `detailed tutorial about using infeeds and outfeeds with TensorFlow <https://github.com/graphcore/tutorials/tree/sdk-release-2.3/tutorials/tensorflow2/infeed_outfeed>`_.
+
+
 Accessing outfeed queue results during execution
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~