Adding documentation to dtypes module and amp

src/dtypes/amp.rs

@@ -1,5 +1,10 @@
 use rand::{distributions::Distribution, Rng};
 
+/// Wrapper type around the storage type. Use like `AMP<f16>` or `AMP<bf16>`.
+///
+/// This causes some tensor operations to cast the type to a higher precision
+/// and then back. For example calling sum on a `AMP<f16>` tensor will cast it to
+/// `f32`, sum it, and then cast it back to `f16`.
 #[derive(Debug, Default, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 #[repr(transparent)]
 pub struct AMP<F>(pub F);

src/dtypes/mod.rs

@@ -1,13 +1,24 @@
+//! Module for data type related traits and structs. Contains things like [Unit], [Dtype], and [AMP].
+//!
+//! When the `f16` feature is enabled, this exports the [f16] type.
+//!
+//! # AMP
+//!
+//! [AMP](https://pytorch.org/docs/stable/amp.html) is a technique for mixed precision training.
+//! This is a data type in dfdx, you can use it like any normal dtype like [`AMP<f16>`] or [`AMP<bf16>`].
+
 mod amp;
 
 pub use amp::AMP;
 
 #[cfg(feature = "f16")]
 pub use half::f16;
 
+/// Represents a type where all 0 bits is a valid pattern.
 #[cfg(not(feature = "cuda"))]
 pub trait SafeZeros {}
 
+/// Represents a type where all 0 bits is a valid pattern.
 #[cfg(feature = "cuda")]
 pub trait SafeZeros: cudarc::driver::ValidAsZeroBits + cudarc::driver::DeviceRepr {}
 
@@ -100,6 +111,7 @@ pub trait HasDtype {
     type Dtype: Dtype;
 }
 
+/// Marker trait for types that are **not** [AMP].
 pub trait NotMixedPrecision {}
 impl NotMixedPrecision for f32 {}
 impl NotMixedPrecision for f64 {}

src/lib.rs

@@ -13,12 +13,12 @@
 //!
 //! # Shapes & Tensors
 //!
-//! *See [shapes] and [tensor] for more information.*
+//! *See [dtypes], [shapes], and [tensor] for more information.*
 //!
 //! At its core a [`tensor::Tensor`] is just a nd-array. Just like
 //! rust arrays there are two parts:
-//! 1. Shape
-//! 2. Dtype
+//! 1. Shape ([shapes])
+//! 2. Dtype ([dtypes])
 //!
 //! dfdx represents shapes as **tuples** of dimensions ([`shapes::Dim`]),
 //! where a dimension can either be known at:
@@ -31,6 +31,7 @@
 //! - `(usize,)` - 1d shape with a runtime known dimension
 //! - `(usize, Const<5>)` - 2d shape with both types of dimensions
 //! - `(Const<3>, usize, Const<5>)` - 3d shape!
+//! - `Rank3<3, 5, 7>` - Equivalent to `(Const<3>, Const<5>, Const<7>)`
 //!
 //! Here are some comparisons between representing nd arrays in rust vs dfdx:
 //!

src/tensor_ops/adam/mod.rs

@@ -10,7 +10,7 @@ use crate::{
 
 use super::WeightDecay;
 
-/// Configuration of hyperparameters for [Adam].
+/// Configuration of hyperparameters for [crate::optim::Adam].
 ///
 /// Changing all default parameters:
 /// ```rust

src/tensor_ops/optim.rs

@@ -28,13 +28,13 @@ pub(super) fn weight_decay_to_cuda(wd: Option<WeightDecay>) -> (WeightDecayType,
     }
 }
 
-/// Momentum used for [super::Sgd] and others
+/// Momentum used for [crate::optim::Sgd] and others
 #[derive(Debug, Clone, Copy)]
 pub enum Momentum {
     /// Momentum that is applied to the velocity of a parameter directly.
     Classic(f64),
 
-    /// Momentum that is applied to both velocity and gradients. See [super::Sgd] nesterov paper for more.
+    /// Momentum that is applied to both velocity and gradients. See [crate::optim::Sgd] nesterov paper for more.
     Nesterov(f64),
 }
 

src/tensor_ops/prelu.rs

@@ -5,8 +5,8 @@ use super::{cmp::*, BroadcastTo, ChooseFrom, Device, TryMul};
 /// [Parametric Rectified Linear Unit (PReLU)](https://pytorch.org/docs/stable/generated/torch.nn.PReLU.html). `max(0, lhs) + rhs*min(0, lhs)`
 ///
 /// In other words, for each element i:
-/// - if lhs[i] < 0, use `lhs[i] * rhs[i]`
-/// - if lhs[i] >= 0, use `lhs[i]`
+/// - if `lhs[i] < 0`, use `lhs[i] * rhs[i]`
+/// - if `lhs[i] >= 0`, use `lhs[i]`
 ///
 ///
 /// Examples:

src/tensor_ops/rmsprop/mod.rs

@@ -10,7 +10,7 @@ use crate::{
 
 use super::WeightDecay;
 
-/// Configuration of hyperparameters for [RMSprop].
+/// Configuration of hyperparameters for [crate::optim::RMSprop].
 #[derive(Debug, Clone, Copy)]
 pub struct RMSpropConfig {
     /// Learning rate. Defaults to `1e-2`.
@@ -59,6 +59,7 @@ pub trait RMSpropKernel<E: Dtype>: Storage<E> {
 }
 
 impl RMSpropConfig {
+    /// Update a single tensor using RMSprop.
     pub fn try_update<S: Shape, E: Dtype, D: RMSpropKernel<E>>(
         &self,
         param: &mut Tensor<S, E, D>,

src/tensor_ops/sgd/mod.rs

@@ -10,7 +10,7 @@ use crate::{
 
 use super::optim::{Momentum, WeightDecay};
 
-/// Configuration of hyperparameters for [Sgd].
+/// Configuration of hyperparameters for [crate::optim::Sgd].
 ///
 /// Using different learning rate:
 /// ```rust
@@ -94,6 +94,7 @@ pub trait SgdKernel<E: Dtype>: Storage<E> {
 }
 
 impl SgdConfig {
+    /// Updates a single tensor using SGD.
     pub fn try_update<S: Shape, E: Dtype, D: SgdKernel<E>>(
         &self,
         param: &mut Tensor<S, E, D>,