[Docs] Introduce Relax API and move legacy part to standalone page

As the TVM project evolves, the Unity strategy has been the recommended
way to use Apache TVM applications. Hence, we are pushing documentation
for the Relax API to the forefront and moving the legacy part to a
standalone page, which may be removed in the future.

docs/index.rst

@@ -51,23 +51,23 @@ driving its costs down.
 
 .. toctree::
    :maxdepth: 1
-   :caption: Architecture  Guide
+   :caption: API Reference
 
-   arch/index
+   reference/api/python/index
+   reference/api/links
 
 .. toctree::
    :maxdepth: 1
-   :caption: Topic Guides
+   :caption: Legacy
 
+   reference/langref/index
+   arch/index
    topic/microtvm/index
    topic/vta/index
 
 .. toctree::
    :maxdepth: 1
-   :caption: Reference Guide
+   :caption: About
 
-   reference/langref/index
-   reference/api/python/index
-   reference/api/links
    reference/publications
-   genindex
+

docs/reference/api/python/dlight.rst

@@ -0,0 +1,22 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.dlight
+----------
+.. automodule:: tvm.dlight
+   :members:
+   :imported-members:

docs/reference/api/python/index.rst

@@ -18,34 +18,89 @@
 Python API
 ==========
 
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm
+
+    error
+    ir
+    instrument
+    transform
+    target
+    driver
+
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm.runtime
+
+    runtime/runtime
+    runtime/ndarray
+    runtime/relax_vm
+    runtime/disco
+    runtime/profiling
+
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm.relax
+
+    relax/relax
+    relax/analysis
+    relax/block_builder
+    relax/frontend
+    relax/op
+    relax/transform
+
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm.tir
+
+    tir/tir
+    tir/analysis
+    tir/schedule
+    tir/stmt_functor
+    tir/transform
+
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm.te
+
+    te
+    topi
+
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm.meta_schedule
+
+    meta_schedule
+
+.. toctree::
+    :maxdepth: 1
+    :caption: tvm.dlight
+
+    dlight
+
+.. toctree::
+    :maxdepth: 1
+    :caption: Misc
+
+    rpc
+    contrib
 
 .. toctree::
-   :maxdepth: 2
-
-   runtime
-   ndarray
-   error
-   ir
-   target
-   tir
-   te
-   driver
-   relay/index
-   relay/frontend
-   relay/nn
-   relay/vision
-   relay/image
-   relay/transform
-   relay/analysis
-   relay/backend
-   relay/dataflow_pattern
-   relay/testing
-   autotvm
-   auto_scheduler
-   meta_schedule
-   rpc
-   micro
-   contrib
-   graph_executor
-   topi
-   vta/index
+    :maxdepth: 1
+    :caption: Legacy
+
+    relay/index
+    relay/frontend
+    relay/nn
+    relay/vision
+    relay/image
+    relay/transform
+    relay/analysis
+    relay/backend
+    relay/dataflow_pattern
+    relay/testing
+    autotvm
+    auto_scheduler
+    micro
+    graph_executor

docs/reference/api/python/instrument.rst

@@ -0,0 +1,22 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.instrument
+--------------
+.. automodule:: tvm.instrument
+   :members:
+   :imported-members:

docs/reference/api/python/relax/analysis.rst

@@ -0,0 +1,23 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.relax.analysis
+------------------
+.. automodule:: tvm.relax.analysis
+   :members:
+   :imported-members:
+

docs/reference/api/python/relax/block_builder.rst

@@ -0,0 +1,21 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.relax.block_builder
+-----------------------
+.. automodule:: tvm.relax.block_builder
+   :members:

docs/reference/api/python/relax/frontend.rst

@@ -0,0 +1,48 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.relax.frontend
+------------------
+.. automodule:: tvm.relax.frontend
+   :members:
+   :imported-members:
+
+tvm.relax.frontend.nn
+*********************
+.. automodule:: tvm.relax.frontend.nn
+   :members:
+   :imported-members:
+   :exclude-members: BlockBuilder
+   :noindex:
+
+tvm.relax.frontend.onnx
+***********************
+.. automodule:: tvm.relax.frontend.onnx
+   :members:
+   :imported-members:
+
+tvm.relax.frontend.stablehlo
+****************************
+.. automodule:: tvm.relax.frontend.stablehlo
+   :members:
+   :imported-members:
+
+tvm.relax.frontend.torch
+************************
+.. automodule:: tvm.relax.frontend.torch
+   :members:
+   :imported-members:

docs/reference/api/python/relax/op.rst

@@ -0,0 +1,73 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.relax.op
+------------
+
+tvm.relax.op
+************
+.. automodule:: tvm.relax.op
+   :members:
+   :imported-members:
+
+tvm.relax.op.nn
+***************
+.. automodule:: tvm.relax.op.nn
+   :members:
+   :imported-members:
+
+tvm.relax.op.builtin
+********************
+.. automodule:: tvm.relax.op.builtin
+   :members:
+   :imported-members:
+
+tvm.relax.op.ccl
+****************
+.. automodule:: tvm.relax.op.ccl
+   :members:
+   :imported-members:
+
+tvm.relax.op.distributed
+************************
+.. automodule:: tvm.relax.op.distributed
+   :members:
+   :imported-members:
+
+tvm.relax.op.grad
+*****************
+.. automodule:: tvm.relax.op.grad
+   :members:
+   :imported-members:
+
+tvm.relax.op.image
+******************
+.. automodule:: tvm.relax.op.image
+   :members:
+   :imported-members:
+
+tvm.relax.op.memory
+*******************
+.. automodule:: tvm.relax.op.memory
+   :members:
+   :imported-members:
+
+tvm.relax.op.op_attrs
+*********************
+.. automodule:: tvm.relax.op.op_attrs
+   :members:
+

docs/reference/api/python/relax/relax.rst

@@ -0,0 +1,23 @@
+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+tvm.relax
+---------
+.. automodule:: tvm.relax
+    :members:
+    :imported-members:
+    :exclude-members: BlockBuilder, Span, GlobalVar, SourceName, TupleType, Type, FuncType