more code blocks for readthedocs

Summary: More rst syntax fixes

Reviewed By: davidsonic

Differential Revision: D40977328

fbshipit-source-id: a3a3accbf2ba7cd9c84a0a82d0265010764a9d61

pytorch3d/io/pluggable.py

@@ -25,19 +25,16 @@ This module has the master functions for loading and saving data.
 The main usage is via the IO object, and its methods
 `load_mesh`, `save_mesh`, `load_pointcloud` and `save_pointcloud`.
 
-For example, to load a mesh you might do
-```
-from pytorch3d.io import IO
+For example, to load a mesh you might do::
 
-mesh = IO().load_mesh("mymesh.obj")
-```
+    from pytorch3d.io import IO
 
-and to save a point cloud you might do
+    mesh = IO().load_mesh("mymesh.obj")
 
-```
-pcl = Pointclouds(...)
-IO().save_pointcloud(pcl, "output_pointcloud.obj")
-```
+and to save a point cloud you might do::
+
+    pcl = Pointclouds(...)
+    IO().save_pointcloud(pcl, "output_pointcloud.obj")
 
 """
 

pytorch3d/io/ply_io.py

@@ -1067,7 +1067,7 @@ def load_ply(
     is to use the IO.load_mesh and IO.load_pointcloud functions,
     which can read more of the data.
 
-    Example .ply file format:
+    Example .ply file format::
 
         ply
         format ascii 1.0           { ascii/binary, format version number }

pytorch3d/ops/points_to_volumes.py

@@ -208,8 +208,8 @@ def add_pointclouds_to_volumes(
     of `initial_volumes` with its `features` and `densities` updated with the
     result of the pointcloud addition.
 
-    Example:
-        ```
+    Example::
+
         # init a random point cloud
         pointclouds = Pointclouds(
             points=torch.randn(4, 100, 3), features=torch.rand(4, 100, 5)
@@ -229,7 +229,6 @@ def add_pointclouds_to_volumes(
             initial_volumes=initial_volumes,
             mode="trilinear",
         )
-        ```
 
     Args:
         pointclouds: Batch of 3D pointclouds represented with a `Pointclouds`

pytorch3d/renderer/implicit/harmonic_embedding.py

@@ -21,8 +21,8 @@ class HarmonicEmbedding(torch.nn.Module):
         (i.e. vector along the last dimension) in `x`
         into a series of harmonic features `embedding`,
         where for each i in range(dim) the following are present
-        in embedding[...]:
-            ```
+        in embedding[...]::
+
             [
                 sin(f_1*x[..., i]),
                 sin(f_2*x[..., i]),
@@ -34,7 +34,7 @@ class HarmonicEmbedding(torch.nn.Module):
                 cos(f_N * x[..., i]),
                 x[..., i],              # only present if append_input is True.
             ]
-            ```
+
         where N corresponds to `n_harmonic_functions-1`, and f_i is a scalar
         denoting the i-th frequency of the harmonic embedding.
 

pytorch3d/renderer/implicit/raymarching.py

@@ -25,20 +25,20 @@ class EmissionAbsorptionRaymarcher(torch.nn.Module):
     (i.e. its density -> 1.0).
 
     EA first utilizes `rays_densities` to compute the absorption function
-    along each ray as follows:
-        ```
+    along each ray as follows::
+
         absorption = cumprod(1 - rays_densities, dim=-1)
-        ```
+
     The value of absorption at position `absorption[..., k]` specifies
     how much light has reached `k`-th point along a ray since starting
     its trajectory at `k=0`-th point.
 
     Each ray is then rendered into a tensor `features` of shape `(..., feature_dim)`
-    by taking a weighed combination of per-ray features `rays_features` as follows:
-        ```
+    by taking a weighed combination of per-ray features `rays_features` as follows::
+
         weights = absorption * rays_densities
         features = (rays_features * weights).sum(dim=-2)
-        ```
+
     Where `weights` denote a function that has a strong peak around the location
     of the first surface point that a given ray passes through.
 

pytorch3d/renderer/implicit/raysampling.py

@@ -32,8 +32,8 @@ class MultinomialRaysampler(torch.nn.Module):
     have uniformly-spaced z-coordinates between a predefined
     minimum and maximum depth.
 
-    The raysampler first generates a 3D coordinate grid of the following form:
-    ```
+    The raysampler first generates a 3D coordinate grid of the following form::
+
            / min_x, min_y, max_depth -------------- / max_x, min_y, max_depth
           /                                        /|
          /                                        / |     ^
@@ -48,7 +48,6 @@ class MultinomialRaysampler(torch.nn.Module):
         min_x                               max_y /                   / n_pts_per_ray
         max_y ----------------------------- max_x/ min_depth         v
                 < --- image_width --- >
-    ```
 
     In order to generate ray points, `MultinomialRaysampler` takes each 3D point of
     the grid (with coordinates `[x, y, depth]`) and unprojects it

pytorch3d/renderer/implicit/renderer.py

@@ -41,13 +41,13 @@ class ImplicitRenderer(torch.nn.Module):
     as well as the `volumetric_function` `Callable`, which defines a field of opacity
     and feature vectors over the 3D domain of the scene.
 
-    A standard `volumetric_function` has the following signature:
-    ```
+    A standard `volumetric_function` has the following signature::
+
         def volumetric_function(
             ray_bundle: Union[RayBundle, HeterogeneousRayBundle],
             **kwargs,
         ) -> Tuple[torch.Tensor, torch.Tensor]
-    ```
+
     With the following arguments:
         `ray_bundle`: A RayBundle or HeterogeneousRayBundle object
             containing the following variables:
@@ -79,8 +79,8 @@ class ImplicitRenderer(torch.nn.Module):
 
     Example:
         A simple volumetric function of a 0-centered
-        RGB sphere with a unit diameter is defined as follows:
-        ```
+        RGB sphere with a unit diameter is defined as follows::
+
             def volumetric_function(
                 ray_bundle: Union[RayBundle, HeterogeneousRayBundle],
                 **kwargs,
@@ -104,7 +104,7 @@ class ImplicitRenderer(torch.nn.Module):
                 ) * 0.5 + 0.5
 
                 return rays_densities, rays_features
-        ```
+
     """
 
     def __init__(self, raysampler: Callable, raymarcher: Callable) -> None:

pytorch3d/renderer/implicit/utils.py

@@ -73,13 +73,13 @@ def ray_bundle_to_ray_points(
     extending each ray according to the corresponding length.
 
     E.g. for 2 dimensional tensors `ray_bundle.origins`, `ray_bundle.directions`
-        and `ray_bundle.lengths`, the ray point at position `[i, j]` is:
-        ```
+        and `ray_bundle.lengths`, the ray point at position `[i, j]` is::
+
             ray_bundle.points[i, j, :] = (
                 ray_bundle.origins[i, :]
                 + ray_bundle.directions[i, :] * ray_bundle.lengths[i, j]
             )
-        ```
+
     Note that both the directions and magnitudes of the vectors in
     `ray_bundle.directions` matter.
 
@@ -109,13 +109,13 @@ def ray_bundle_variables_to_ray_points(
     ray length:
 
     E.g. for 2 dimensional input tensors `rays_origins`, `rays_directions`
-    and `rays_lengths`, the ray point at position `[i, j]` is:
-        ```
+    and `rays_lengths`, the ray point at position `[i, j]` is::
+
             rays_points[i, j, :] = (
                 rays_origins[i, :]
                 + rays_directions[i, :] * rays_lengths[i, j]
             )
-        ```
+
     Note that both the directions and magnitudes of the vectors in
     `rays_directions` matter.
 

pytorch3d/renderer/opengl/opengl_utils.py

@@ -285,26 +285,26 @@ class _DeviceContextStore:
 
     The EGL/CUDA contexts are not meant to be created and destroyed all the time,
     and having multiple on a single device can be troublesome. Intended use is entirely
-    transparent to the user:
+    transparent to the user::
 
-    ```
         rasterizer1 = MeshRasterizerOpenGL(...some args...)
         mesh1 = load_mesh_on_cuda_0()
 
-    # Now rasterizer1 will request EGL/CUDA contexts from global_device_context_store
-    # on cuda:0, and since there aren't any, the store will create new ones.
+        # Now rasterizer1 will request EGL/CUDA contexts from
+        # global_device_context_store on cuda:0, and since there aren't any, the
+        # store will create new ones.
         rasterizer1.rasterize(mesh1)
 
-    # rasterizer2 also needs EGL & CUDA contexts. But global_context_store already has
-    # them for cuda:0. Instead of creating new contexts, the store will tell rasterizer2
-    # to use them.
+        # rasterizer2 also needs EGL & CUDA contexts. But global_context_store
+        # already has them for cuda:0. Instead of creating new contexts, the store
+        # will tell rasterizer2 to use them.
         rasterizer2 = MeshRasterizerOpenGL(dcs)
         rasterize2.rasterize(mesh1)
 
         # When rasterizer1 needs to render on cuda:1, the store will create new contexts.
         mesh2 = load_mesh_on_cuda_1()
         rasterizer1.rasterize(mesh2)
-    ```
+
     """
 
     def __init__(self):

pytorch3d/renderer/points/pulsar/renderer.py

@@ -11,7 +11,6 @@ Proper Python support for pytorch requires creating a torch.autograd.function
 here and a torch.nn.Module is exposed for the use in more complex models.
 """
 import logging
-import math
 import warnings
 from typing import Optional, Tuple, Union
 

pytorch3d/structures/volumes.py

@@ -97,12 +97,12 @@ class Volumes:
               in the world coordinates.
             - They are specified with the following mapping that converts
               points `x_local` in the local coordinates to points `x_world`
-              in the world coordinates:
-                ```
+              in the world coordinates::
+
                     x_world = (
                         x_local * (volume_size - 1) * 0.5 * voxel_size
                     ) - volume_translation,
-                ```
+
               here `voxel_size` specifies the size of each voxel of the volume,
               and `volume_translation` is the 3D offset of the central voxel of
               the volume w.r.t. the origin of the world coordinate frame.
@@ -110,12 +110,12 @@ class Volumes:
               the world coordinate units. `volume_size` is the spatial size of
               the volume in form of a 3D vector `[width, height, depth]`.
             - Given the above definition of `x_world`, one can derive the
-              inverse mapping from `x_world` to `x_local` as follows:
-                ```
+              inverse mapping from `x_world` to `x_local` as follows::
+
                     x_local = (
                         (x_world + volume_translation) / (0.5 * voxel_size)
                     ) / (volume_size - 1)
-                ```
+
             - For a trivial volume with `volume_translation==[0, 0, 0]`
               with `voxel_size=-1`, `x_world` would range
               from -(volume_size-1)/2` to `+(volume_size-1)/2`.
@@ -139,13 +139,13 @@ class Volumes:
           to `x_local=(-1, 0, 1)`.
         - For a "trivial" volume `v` with `voxel_size = 1.`,
           `volume_translation=[0., 0., 0.]`, the following holds:
-            ```
+
                 torch.nn.functional.grid_sample(
                     v.densities(),
                     v.get_coord_grid(world_coordinates=False),
                     align_corners=True,
                 ) == v.densities(),
-            ```
+
             i.e. sampling the volume at trivial local coordinates
             (no scaling with `voxel_size`` or shift with `volume_translation`)
             results in the same volume.
@@ -588,12 +588,12 @@ class VolumeLocator:
               in the world coordinates.
             - They are specified with the following mapping that converts
               points `x_local` in the local coordinates to points `x_world`
-              in the world coordinates:
-                ```
+              in the world coordinates::
+
                     x_world = (
                         x_local * (volume_size - 1) * 0.5 * voxel_size
                     ) - volume_translation,
-                ```
+
               here `voxel_size` specifies the size of each voxel of the volume,
               and `volume_translation` is the 3D offset of the central voxel of
               the volume w.r.t. the origin of the world coordinate frame.
@@ -601,12 +601,12 @@ class VolumeLocator:
               the world coordinate units. `volume_size` is the spatial size of
               the volume in form of a 3D vector `[width, height, depth]`.
             - Given the above definition of `x_world`, one can derive the
-              inverse mapping from `x_world` to `x_local` as follows:
-                ```
+              inverse mapping from `x_world` to `x_local` as follows::
+
                     x_local = (
                         (x_world + volume_translation) / (0.5 * voxel_size)
                     ) / (volume_size - 1)
-                ```
+
             - For a trivial volume with `volume_translation==[0, 0, 0]`
               with `voxel_size=-1`, `x_world` would range
               from -(volume_size-1)/2` to `+(volume_size-1)/2`.
@@ -629,14 +629,14 @@ class VolumeLocator:
           `DxHxW = 5x5x5`, the point `x_world = (-2, 0, 2)` gets mapped
           to `x_local=(-1, 0, 1)`.
         - For a "trivial" volume `v` with `voxel_size = 1.`,
-          `volume_translation=[0., 0., 0.]`, the following holds:
-            ```
+          `volume_translation=[0., 0., 0.]`, the following holds::
+
                 torch.nn.functional.grid_sample(
                     v.densities(),
                     v.get_coord_grid(world_coordinates=False),
                     align_corners=True,
                 ) == v.densities(),
-            ```
+
             i.e. sampling the volume at trivial local coordinates
             (no scaling with `voxel_size`` or shift with `volume_translation`)
             results in the same volume.

pytorch3d/transforms/math.py

@@ -22,8 +22,8 @@ def acos_linear_extrapolation(
     domain of `(-1, 1)`. This allows for stable backpropagation in case `x`
     is not guaranteed to be strictly within `(-1, 1)`.
 
-    More specifically:
-    ```
+    More specifically::
+
         bounds=(lower_bound, upper_bound)
         if lower_bound <= x <= upper_bound:
             acos_linear_extrapolation(x) = acos(x)
@@ -33,7 +33,6 @@ def acos_linear_extrapolation(
         else:  # x >= upper_bound
             acos_linear_extrapolation(x)
                 = acos(upper_bound) + dacos/dx(upper_bound) * (x - upper_bound)
-    ```
 
     Args:
         x: Input `Tensor`.

pytorch3d/transforms/transform3d.py

@@ -256,12 +256,12 @@ class Transform3d:
 
         The conversion from the 4x4 SE(3) matrix `transform` to the
         6D representation `log_transform = [log_translation | log_rotation]`
-        is done as follows:
-            ```
+        is done as follows::
+
             log_transform = log(transform.get_matrix())
             log_translation = log_transform[3, :3]
             log_rotation = inv_hat(log_transform[:3, :3])
-            ```
+
         where `log` is the matrix logarithm
         and `inv_hat` is the inverse of the Hat operator [2].
 

pytorch3d/utils/camera_conversions.py

@@ -35,10 +35,10 @@ def cameras_from_opencv_projection(
     to the NDC screen convention of PyTorch3D.
 
     More specifically, the OpenCV convention projects points to the OpenCV screen
-    space as follows:
-        ```
+    space as follows::
+
         x_screen_opencv = camera_matrix @ (R @ x_world + tvec)
-        ```
+
     followed by the homogenization of `x_screen_opencv`.
 
     Note: