[Tune] Remove some old examples (ray-project#37657)

Remove some old examples of optimizers that are not used much according to our telemetry. We should focus on concentrating adoption on the popular ones.

---------

Signed-off-by: Philipp Moritz <pcmoritz@gmail.com>

doc/source/_toc.yml

@@ -219,8 +219,6 @@ parts:
                     title: "Ax Example"
                   - file: tune/examples/dragonfly_example
                     title: "Dragonfly Example"
-                  - file: tune/examples/skopt_example
-                    title: "Skopt Example"
                   - file: tune/examples/hyperopt_example
                     title: "HyperOpt Example"
                   - file: tune/examples/bayesopt_example
@@ -233,12 +231,8 @@ parts:
                     title: "Nevergrad Example"
                   - file: tune/examples/optuna_example
                     title: "Optuna Example"
-                  - file: tune/examples/zoopt_example
-                    title: "ZOOpt Example"
                   - file: tune/examples/sigopt_example
                     title: "SigOpt Example"
-                  - file: tune/examples/hebo_example
-                    title: "HEBO Example"
               - file: tune/examples/other-examples
                 title: "Other Examples"
               - file: tune/examples/exercises

doc/source/ray-overview/examples.rst

@@ -485,13 +485,6 @@ Ray Examples
 
             How To Use Tune With Dragonfly
 
-    .. grid-item-card:: :bdg-secondary:`Code example`
-        :class-item: gallery-item tuning
-
-        .. button-ref:: /tune/examples/skopt_example
-
-            How To Use Tune With Scikit-Optimize
-
     .. grid-item-card:: :bdg-secondary:`Code example`
         :class-item: gallery-item tuning
 
@@ -534,27 +527,13 @@ Ray Examples
 
             How To Use Tune With Optuna
 
-    .. grid-item-card:: :bdg-secondary:`Code example`
-        :class-item: gallery-item tuning
-
-        .. button-ref:: /tune/examples/zoopt_example
-
-            How To Use Tune With ZOOpt
-
     .. grid-item-card:: :bdg-secondary:`Code example`
         :class-item: gallery-item tuning
 
         .. button-ref:: /tune/examples/sigopt_example
 
             How To Use Tune With SigOpt
 
-    .. grid-item-card:: :bdg-secondary:`Code example`
-        :class-item: gallery-item tuning
-
-        .. button-ref:: /tune/examples/hebo_example
-
-            How To Use Tune With HEBO
-
     .. grid-item-card:: :bdg-warning:`Video`
         :class-item: gallery-item tuning serving
 

doc/source/tune/examples/hpo-frameworks.rst

@@ -25,14 +25,6 @@ on each of our integrations:
 
             How To Use Tune With Dragonfly
 
-    .. grid-item-card::
-        :img-top: ../images/skopt.png
-        :class-img-top: pt-2 w-75 d-block mx-auto fixed-height-img
-
-        .. button-ref:: skopt_example
-
-            How To Use Tune With Scikit-Optimize
-
     .. grid-item-card::
         :img-top: ../images/hyperopt.png
         :class-img-top: pt-2 w-75 d-block mx-auto fixed-height-img
@@ -81,26 +73,10 @@ on each of our integrations:
 
             How To Use Tune With Optuna
 
-    .. grid-item-card::
-        :img-top: ../images/zoopt.png
-        :class-img-top: pt-2 w-75 d-block mx-auto fixed-height-img
-
-        .. button-ref:: zoopt_example
-
-            How To Use Tune With ZOOpt
-
     .. grid-item-card::
         :img-top: ../images/sigopt.png
         :class-img-top: pt-2 w-75 d-block mx-auto fixed-height-img
 
         .. button-ref:: sigopt_example
 
             How To Use Tune With SigOpt
-
-    .. grid-item-card::
-        :img-top: ../images/hebo.png
-        :class-img-top: pt-2 w-75 d-block mx-auto fixed-height-img
-
-        .. button-ref:: hebo_example
-
-            How To Use Tune With HEBO