Fix missing/feature guarded UniqueId import

Author: elftausend

Cargo.toml

@@ -51,7 +51,7 @@ min-cl = { git = "https://github.com/elftausend/min-cl", optional = true }
 # min-cl = { version = "0.3.0", optional=true }
 
 [features]
-default = ["cpu", "opencl", "blas", "static-api", "stack", "macro", "untyped", "autograd", "autograd", "cached", "lazy", "fork", "graph", "serde"]
+default = ["cpu", "opencl", "blas", "static-api", "stack", "macro", "untyped", "autograd", "autograd", "cached", "lazy", "fork", "graph", "serde", "cuda"]
 # default = ["cpu"]
 # default = ["no-std"]
 # default = ["opencl"]

src/modules/cached.rs

@@ -7,11 +7,11 @@ use crate::{
     AddGradFn, AddLayer, AddOperation, Alloc, Buffer, Cache, CachedBuffers, Cursor, Device,
     ExecNow, FastCache, HasId, HasModules, IsShapeIndep, Module, OnDropBuffer, OnNewBuffer,
     Parents, PtrType, RemoveLayer, ReplaceBuf, Retrieve, RunModule, SetOpHint, Setup, ShallowCopy,
-    Shape, Unit, WrappedData,
+    Shape, Unit, WrappedData, UniqueId
 };
 
 #[cfg(feature = "graph")]
-use crate::{DeviceError, Optimize, UniqueId};
+use crate::{DeviceError, Optimize};
 
 // creator struct, however =>
 // TODO: could remove D generic and therefore CachedModule