Expose TensorLike and Gradients::get_ref_checked (#845)

* Expose TensorLike and Gradients::get_ref_checked

* Fixing clippy warning

src/tensor/gradients.rs

@@ -77,7 +77,7 @@ impl<E, D: Storage<E>> Gradients<E, D> {
     }
 
     /// Returns a reference to the underlying gradient if found.
-    pub(crate) fn get_ref_checked<S: Shape, T>(&self, t: &Tensor<S, E, D, T>) -> Option<&D::Vec> {
+    pub fn get_ref_checked<S: Shape, T>(&self, t: &Tensor<S, E, D, T>) -> Option<&D::Vec> {
         self.gradient_by_id.get(&t.id)
     }
 

src/tensor/mod.rs

@@ -157,7 +157,7 @@ mod tensor_impls;
 
 pub(crate) use ghost::GhostTensor;
 pub(crate) use storage_traits::{OneFillStorage, ZeroFillStorage};
-pub(crate) use tensorlike::Tensorlike;
+pub use tensorlike::Tensorlike;
 
 pub use cpu::{Cpu, CpuError};
 #[cfg(not(feature = "cuda"))]

src/tensor/tensorlike.rs

@@ -10,6 +10,7 @@ use super::{storage_traits::AllocGrad, GhostTensor, Tensor, UniqueId};
 /// exists to unify handling of [Tensor] and [GhostTensor].
 ///
 /// *If it looks like a tensor and barks like a tensor, then pet it like a tensor.*
+#[allow(clippy::len_without_is_empty)]
 pub trait Tensorlike<S: Shape, E, D: Storage<E>>:
     AllocGrad<Gradient = D::Vec> + HasErr<Err = D::Err> + HasShape<Shape = S>
 {