Add some documentation. (#743)

candle-core/src/dtype.rs

@@ -1,15 +1,24 @@
+//! Types for elements that can be stored and manipulated using tensors.
 #![allow(clippy::redundant_closure_call)]
 use crate::backend::BackendStorage;
 use crate::{CpuStorage, Error, Result};
 
+/// The different types of elements allowed in tensors.
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub enum DType {
+    // Unsigned 8 bits integer.
     U8,
+    // Unsigned 32 bits integer.
     U32,
+    // Signed 64 bits integer.
     I64,
+    // Brain floating-point using half precision (16 bits).
     BF16,
+    // Floating-point using half precision (16 bits).
     F16,
+    // Floating-point using single precision (32 bits).
     F32,
+    // Floating-point using double precision (64 bits).
     F64,
 }
 
@@ -33,6 +42,7 @@ impl std::str::FromStr for DType {
 }
 
 impl DType {
+    /// String representation for dtypes.
     pub fn as_str(&self) -> &'static str {
         match self {
             Self::U8 => "u8",
@@ -45,6 +55,7 @@ impl DType {
         }
     }
 
+    /// The size used by each element in bytes, i.e. 1 for `U8`, 4 for `F32`.
     pub fn size_in_bytes(&self) -> usize {
         match self {
             Self::U8 => 1,

candle-core/src/shape.rs

@@ -1,3 +1,4 @@
+//! The shape of a tensor is a tuple with the size of each of its dimensions.
 #![allow(clippy::redundant_closure_call)]
 use crate::{Error, Result};
 
@@ -119,6 +120,7 @@ impl Shape {
         Self(dims.to_vec())
     }
 
+    /// The rank is the number of dimensions, 0 for a scalar value, 1 for a vector, etc.
     pub fn rank(&self) -> usize {
         self.0.len()
     }
@@ -127,10 +129,12 @@ impl Shape {
         self.0
     }
 
+    /// The dimensions as a slice of `usize`.
     pub fn dims(&self) -> &[usize] {
         &self.0
     }
 
+    /// The total number of elements, this is the product of all dimension sizes.
     pub fn elem_count(&self) -> usize {
         self.0.iter().product()
     }
@@ -182,6 +186,8 @@ impl Shape {
         true
     }
 
+    /// Modifies the shape by adding a list of additional dimensions at the end of the existing
+    /// dimensions.
     pub fn extend(mut self, additional_dims: &[usize]) -> Self {
         self.0.extend(additional_dims);
         self

candle-core/src/tensor.rs

@@ -1,3 +1,4 @@
+//! Tensors are N-dimenional matrixes of elements using a single data type.
 #![allow(clippy::redundant_closure_call)]
 use crate::backend::{BackendDevice, BackendStorage};
 use crate::op::{