[train][docs] remove session diagram (ray-project#39838)

Signed-off-by: Matthew Deng <[email protected]>
lmco · Sep 25, 2023 · c87fef3 · c87fef3
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diff --git a/doc/source/train/images/session.svg b/doc/source/train/images/session.svg
diff --git a/doc/source/train/user-guides/monitoring-logging.rst b/doc/source/train/user-guides/monitoring-logging.rst
@@ -57,18 +57,6 @@ the end of each training epoch.
                 )
                 trainer.fit()
 
-The session concept exists on several levels: The execution layer (called `Tune Session`) and the Data Parallel training layer
-(called `Train Session`).
-The following figure shows how these two sessions look like in a Data Parallel training scenario.
-
-..
-  https://docs.google.com/drawings/d/1bydKt9pKy36DsQuCPJ8LmTUj3lbhHhQLjYDofDHbOSE/edit
-
-.. image:: /train/images/session.svg
-   :width: 650px
-   :align: center
-
-
 .. _train-aggregating-results:
 
 How to obtain and aggregate results from different workers?