Implement all missing docstrings (#5298)

Co-authored-by: snyk-bot <snyk-bot@snyk.io>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

ultralytics/models/sam/modules/encoders.py

@@ -12,6 +12,18 @@ from ultralytics.nn.modules import LayerNorm2d, MLPBlock
 
 # This class and its supporting functions below lightly adapted from the ViTDet backbone available at: https://github.com/facebookresearch/detectron2/blob/main/detectron2/modeling/backbone/vit.py # noqa
 class ImageEncoderViT(nn.Module):
+    """
+    An image encoder using Vision Transformer (ViT) architecture for encoding an image into a compact latent space. The
+    encoder takes an image, splits it into patches, and processes these patches through a series of transformer blocks.
+    The encoded patches are then processed through a neck to generate the final encoded representation.
+
+    Attributes:
+        img_size (int): Dimension of input images, assumed to be square.
+        patch_embed (PatchEmbed): Module for patch embedding.
+        pos_embed (nn.Parameter, optional): Absolute positional embedding for patches.
+        blocks (nn.ModuleList): List of transformer blocks for processing patch embeddings.
+        neck (nn.Sequential): Neck module to further process the output.
+    """
 
     def __init__(
             self,
@@ -112,6 +124,22 @@ class ImageEncoderViT(nn.Module):
 
 
 class PromptEncoder(nn.Module):
+    """
+    Encodes different types of prompts, including points, boxes, and masks, for input to SAM's mask decoder. The encoder
+    produces both sparse and dense embeddings for the input prompts.
+
+    Attributes:
+        embed_dim (int): Dimension of the embeddings.
+        input_image_size (Tuple[int, int]): Size of the input image as (H, W).
+        image_embedding_size (Tuple[int, int]): Spatial size of the image embedding as (H, W).
+        pe_layer (PositionEmbeddingRandom): Module for random position embedding.
+        num_point_embeddings (int): Number of point embeddings for different types of points.
+        point_embeddings (nn.ModuleList): List of point embeddings.
+        not_a_point_embed (nn.Embedding): Embedding for points that are not a part of any label.
+        mask_input_size (Tuple[int, int]): Size of the input mask.
+        mask_downscaling (nn.Sequential): Neural network for downscaling the mask.
+        no_mask_embed (nn.Embedding): Embedding for cases where no mask is provided.
+    """
 
     def __init__(
         self,