Removing cuda default.

Seems very important for a lot of exploring users usually on laptop
without GPUs.

Adding more README instructions in a follow up.

Cargo.toml

@@ -2,13 +2,15 @@
 members = [
     "candle-core",
     "candle-examples",
-    "candle-kernels",
     "candle-hub",
     "candle-nn",
-    "candle-pyo3",
     "candle-transformers",
     "candle-wasm-example",
 ]
+exclude = [
+    "candle-kernels",
+    "candle-pyo3",
+]
 
 [profile.release-with-debug]
 inherits = "release"

candle-core/Cargo.toml

@@ -34,6 +34,6 @@ zip = { version = "0.6.6", default-features=false }
 anyhow = { version = "1", features = ["backtrace"] }
 
 [features]
-default = ["cuda"]
+default = []
 cuda = ["dep:cudarc", "dep:candle-kernels"]
 mkl = ["dep:libc", "dep:intel-mkl-src"]

candle-examples/Cargo.toml

@@ -28,6 +28,6 @@ tokenizers = { version = "0.13.3", default-features=false, features=["onig"] }
 wav = "1.0.0"
 
 [features]
-default = ["cuda"]
+default = []
 cuda = ["candle/cuda", "candle-nn/cuda", "candle-transformers/cuda"]
 mkl = ["dep:intel-mkl-src", "candle/mkl", "candle-nn/mkl", "candle-transformers/mkl"]

candle-examples/examples/bert/main.rs

@@ -495,10 +495,19 @@ struct Args {
 
 impl Args {
     fn build_model_and_tokenizer(&self) -> Result<(BertModel, Tokenizer)> {
+        #[cfg(feature = "cuda")]
+        let default_device = Device::new_cuda(0)?;
+
+        #[cfg(not(feature = "cuda"))]
+        let default_device = {
+            println!("Running on CPU, to run on GPU, run this example with `--features cuda`");
+            Device::Cpu
+        };
+
         let device = if self.cpu {
             Device::Cpu
         } else {
-            Device::new_cuda(0)?
+            default_device
         };
         let default_model = "sentence-transformers/all-MiniLM-L6-v2".to_string();
         let default_revision = "refs/pr/21".to_string();

candle-examples/examples/falcon/main.rs

@@ -119,10 +119,19 @@ struct Args {
 
 fn main() -> Result<()> {
     let args = Args::parse();
+
+    #[cfg(feature = "cuda")]
+    let default_device = Device::new_cuda(0)?;
+
+    #[cfg(not(feature = "cuda"))]
+    let default_device = {
+        println!("Running on CPU, to run on GPU, run this example with `--features cuda`");
+        Device::Cpu
+    };
     let device = if args.cpu {
         Device::Cpu
     } else {
-        Device::new_cuda(0)?
+        default_device
     };
 
     let start = std::time::Instant::now();

candle-examples/examples/llama/main.rs

@@ -133,10 +133,20 @@ fn main() -> Result<()> {
     use tokenizers::Tokenizer;
 
     let args = Args::parse();
+
+    #[cfg(feature = "cuda")]
+    let default_device = Device::new_cuda(0)?;
+
+    #[cfg(not(feature = "cuda"))]
+    let default_device = {
+        println!("Running on CPU, to run on GPU, run this example with `--features cuda`");
+        Device::Cpu
+    };
+
     let device = if args.cpu {
         Device::Cpu
     } else {
-        Device::new_cuda(0)?
+        default_device
     };
     let config = Config::config_7b();
     let cache = model::Cache::new(!args.no_kv_cache, &config, &device);

candle-examples/examples/musicgen/main.rs

@@ -41,10 +41,18 @@ fn main() -> Result<()> {
     use tokenizers::Tokenizer;
 
     let args = Args::parse();
+    #[cfg(feature = "cuda")]
+    let default_device = Device::new_cuda(0)?;
+
+    #[cfg(not(feature = "cuda"))]
+    let default_device = {
+        println!("Running on CPU, to run on GPU, run this example with `--features cuda`");
+        Device::Cpu
+    };
     let device = if args.cpu {
         Device::Cpu
     } else {
-        Device::new_cuda(0)?
+        default_device
     };
 
     let mut tokenizer = Tokenizer::from_file(args.tokenizer).map_err(E::msg)?;

candle-examples/examples/whisper/main.rs

@@ -257,10 +257,20 @@ struct Args {
 
 fn main() -> Result<()> {
     let args = Args::parse();
+
+    #[cfg(feature = "cuda")]
+    let default_device = Device::new_cuda(0)?;
+
+    #[cfg(not(feature = "cuda"))]
+    let default_device = {
+        println!("Running on CPU, to run on GPU, run this example with `--features cuda`");
+        Device::Cpu
+    };
+
     let device = if args.cpu {
         Device::Cpu
     } else {
-        Device::new_cuda(0)?
+        default_device
     };
     let default_model = "openai/whisper-tiny.en".to_string();
     let path = std::path::PathBuf::from(default_model.clone());

candle-nn/Cargo.toml

@@ -19,6 +19,6 @@ intel-mkl-src = {version="0.8.1", optional=true, features = ["mkl-dynamic-lp64-i
 anyhow = { version = "1", features = ["backtrace"] }
 
 [features]
-default = ["cuda"]
+default = []
 cuda = ["candle/cuda"]
 mkl = ["dep:intel-mkl-src", "candle/mkl"]

candle-pyo3/Cargo.toml

@@ -21,5 +21,5 @@ pyo3 = { version = "0.19.0", features = ["extension-module"] }
 half = { version = "2.3.1", features = ["num-traits"] }
 
 [features]
-default = ["cuda"]
+default = []
 cuda = ["candle/cuda"]

candle-transformers/Cargo.toml

@@ -20,6 +20,6 @@ rand = "0.8.5"
 wav = "1.0.0"
 
 [features]
-default = ["cuda"]
+default = []
 cuda = ["candle/cuda", "candle-nn/cuda"]
 mkl = ["dep:intel-mkl-src", "candle/mkl", "candle-nn/mkl"]

candle-wasm-example/Cargo.toml

@@ -14,8 +14,8 @@ readme = "README.md"
 crate-type = ["cdylib"]
 
 [dependencies]
-candle = { path = "../candle-core", default-features=false }
+candle = { path = "../candle-core" }
-candle-nn = { path = "../candle-nn", default-features=false }
+candle-nn = { path = "../candle-nn" }
 wasm-bindgen = "0.2.87"
 getrandom = { version = "0.2", features = ["js"] }
 tokenizers = { version = "0.13.3", default-features=false, features=["unstable_wasm"] }