removed tutorial markdown and refreshed rst files for consistency

docs/colossalai/colossalai.nn.loss.loss_moe.rst

+colossalai.nn.loss.loss\_moe
+============================
+
+.. automodule:: colossalai.nn.loss.loss_moe
+   :members:

docs/colossalai/colossalai.nn.loss.rst

 colossalai.nn.loss
 ==================
 
-.. toctree::
-   :maxdepth: 2
+.. automodule:: colossalai.nn.loss
+   :members:
 
-   colossalai.nn.loss.cross_entropy_2d
-   colossalai.nn.loss.cross_entropy_2p5d
-   colossalai.nn.loss.cross_entropy_3d
 
+.. toctree::
+   :maxdepth: 2
 
-.. automodule:: colossalai.nn.loss
-   :members:
+   colossalai.nn.loss.loss_2d
+   colossalai.nn.loss.loss_2p5d
+   colossalai.nn.loss.loss_3d
+   colossalai.nn.loss.loss_moe

docs/colossalai/colossalai.nn.lr_scheduler.rst

 colossalai.nn.lr\_scheduler
 ===========================
 
+.. automodule:: colossalai.nn.lr_scheduler
+   :members:
+
+
 .. toctree::
    :maxdepth: 2
 
@@ -11,7 +15,3 @@ colossalai.nn.lr\_scheduler
    colossalai.nn.lr_scheduler.onecycle
    colossalai.nn.lr_scheduler.poly
    colossalai.nn.lr_scheduler.torch
-
-   
-.. automodule:: colossalai.nn.lr_scheduler
-   :members:

docs/colossalai/colossalai.nn.metric.accuracy_2d.rst

+colossalai.nn.metric.accuracy\_2d
+=================================
+
+.. automodule:: colossalai.nn.metric.accuracy_2d
+   :members:

docs/colossalai/colossalai.nn.metric.accuracy_2p5d.rst

+colossalai.nn.metric.accuracy\_2p5d
+===================================
+
+.. automodule:: colossalai.nn.metric.accuracy_2p5d
+   :members:

docs/colossalai/colossalai.nn.metric.accuracy_3d.rst

+colossalai.nn.metric.accuracy\_3d
+=================================
+
+.. automodule:: colossalai.nn.metric.accuracy_3d
+   :members:

docs/colossalai/colossalai.nn.metric.rst

+colossalai.nn.metric
+====================
+
+.. automodule:: colossalai.nn.metric
+   :members:
+
+
+.. toctree::
+   :maxdepth: 2
+
+   colossalai.nn.metric.accuracy_2d
+   colossalai.nn.metric.accuracy_2p5d
+   colossalai.nn.metric.accuracy_3d

docs/colossalai/colossalai.nn.model.model_from_config.rst

 colossalai.nn.model.model\_from\_config
-===============================
+=======================================
 
 .. automodule:: colossalai.nn.model.model_from_config
    :members:

docs/colossalai/colossalai.nn.model.rst

 colossalai.nn.model
 ===================
 
+.. automodule:: colossalai.nn.model
+   :members:
+
+
 .. toctree::
    :maxdepth: 2
 

docs/colossalai/colossalai.nn.optimizer.colossalai_optimizer.rst

+colossalai.nn.optimizer.colossalai\_optimizer
+=============================================
+
+.. automodule:: colossalai.nn.optimizer.colossalai_optimizer
+   :members:

docs/colossalai/colossalai.nn.optimizer.rst

 colossalai.nn.optimizer
 =======================
 
+.. automodule:: colossalai.nn.optimizer
+   :members:
+
+
 .. toctree::
    :maxdepth: 2
 
+   colossalai.nn.optimizer.colossalai_optimizer
    colossalai.nn.optimizer.fused_adam
    colossalai.nn.optimizer.fused_lamb
    colossalai.nn.optimizer.fused_sgd
    colossalai.nn.optimizer.lamb
    colossalai.nn.optimizer.lars
-
-
-.. automodule:: colossalai.nn.optimizer
-   :members:

docs/colossalai/colossalai.nn.rst

 colossalai.nn
 =============
 
+.. automodule:: colossalai.nn
+   :members:
+
 .. toctree::
    :maxdepth: 2
 
    colossalai.nn.layer
    colossalai.nn.loss
    colossalai.nn.lr_scheduler
+   colossalai.nn.metric
    colossalai.nn.model
    colossalai.nn.optimizer
 
 
-.. automodule:: colossalai.nn
-   :members:
+.. toctree::
+   :maxdepth: 2
+
+   colossalai.nn.init

docs/colossalai/colossalai.registry.rst

 colossalai.registry
 ===================
 
+.. automodule:: colossalai.registry
+   :members:
+
+
 .. toctree::
    :maxdepth: 2
 
    colossalai.registry.registry
-
-
-.. automodule:: colossalai.registry
-   :members:

docs/colossalai/colossalai.rst

 colossalai
 ==========
 
-.. toctree::
-   :maxdepth: 2
-
-   colossalai.constants
-   colossalai.core
-   colossalai.initialize
-
+.. automodule:: colossalai
+   :members:
 
 .. toctree::
    :maxdepth: 2
@@ -17,6 +12,7 @@ colossalai
    colossalai.communication
    colossalai.context
    colossalai.engine
+   colossalai.kernel
    colossalai.logging
    colossalai.nn
    colossalai.registry
@@ -24,5 +20,8 @@ colossalai
    colossalai.utils
    colossalai.zero
 
-.. automodule:: colossalai
-   :members:
+
+.. toctree::
+   :maxdepth: 2
+
+   colossalai.initialize

docs/colossalai/colossalai.trainer.metric.rst

-colossalai.trainer.metric
-=========================
-
-.. automodule:: colossalai.trainer.metric
-   :members:

docs/colossalai/colossalai.trainer.rst

 colossalai.trainer
 ==================
 
-.. toctree::
-   :maxdepth: 2
-
-   colossalai.trainer.hooks
-
+.. automodule:: colossalai.trainer
+   :members:
 
 .. toctree::
    :maxdepth: 2
 
-   colossalai.trainer.metric
-
-
-.. automodule:: colossalai.trainer
-   :members:
+   colossalai.trainer.hooks

docs/colossalai/colossalai.utils.data_sampler.base_sampler.rst

+colossalai.utils.data\_sampler.base\_sampler
+============================================
+
+.. automodule:: colossalai.utils.data_sampler.base_sampler
+   :members:

docs/colossalai/colossalai.utils.data_sampler.data_parallel_sampler.rst

+colossalai.utils.data\_sampler.data\_parallel\_sampler
+======================================================
+
+.. automodule:: colossalai.utils.data_sampler.data_parallel_sampler
+   :members:

docs/colossalai/colossalai.utils.data_sampler.rst

 colossalai.utils.data\_sampler
-=======================================
+==============================
 
 .. automodule:: colossalai.utils.data_sampler
    :members:
+
+
+.. toctree::
+   :maxdepth: 2
+
+   colossalai.utils.data_sampler.base_sampler
+   colossalai.utils.data_sampler.data_parallel_sampler

docs/colossalai/colossalai.utils.multi_tensor_apply.multi_tensor_apply.rst

+colossalai.utils.multi\_tensor\_apply.multi\_tensor\_apply
+==========================================================
+
+.. automodule:: colossalai.utils.multi_tensor_apply.multi_tensor_apply
+   :members: