feat/serialization: add serialization

Cargo.toml

@@ -13,6 +13,8 @@ readme = "README.md"
 keywords = ["deep-learning", "neural-networks", "machine-learning", "framework"]
 license = "MIT OR Apache-2.0"
 
+build = "build.rs"
+
 [dependencies]
 collenchyma = { version = "0.0.8", default-features = false, features = ["native"] } # native feature to read/write data into tensors
 collenchyma-blas = { version = "0.2.0", default-features = false, features = ["native"] } # only compiles with native feature
@@ -22,10 +24,15 @@ log = "0.3.2"
 rand = "0.3.0"
 num = "0.1"
 
-clippy = { version = "0.0.41", optional = true }
+capnp = "0.6.2"
 
 timeit = "0.1.2"
 
+clippy = { version = "0.0.41", optional = true }
+
+[build-dependencies]
+capnpc = "0.6.1"
+
 [dev-dependencies]
 env_logger = "0.3"
 

build.rs

@@ -0,0 +1,5 @@
+extern crate capnpc;
+
+fn main() {
+    ::capnpc::compile("capnp", &["capnp/leaf.capnp"]).unwrap();
+}

capnp/leaf.capnp

@@ -0,0 +1,92 @@
+@0x8316e0f30c445924;
+
+# The structs here try to mirror all the *Config structs as close as possible.
+# Before changing anything take a look at https://capnproto.org/language.html#evolving-your-protocol
+
+struct Weight {
+  name @0 :Text;
+  tensor @1 :Tensor;
+}
+
+struct Tensor {
+  shape @0 :List(UInt64);
+  data @1 :List(Float32);
+}
+
+struct Layer {
+  name @0 :Text;
+  config @1 :LayerConfig;
+  weightsData @2 :List(Weight);
+}
+
+struct LayerConfig {
+  name @0 :Text;
+  layerType :union {
+    # Common layers
+    convolution @1 :ConvolutionConfig;
+    linear @2 :LinearConfig;
+    logSoftmax @3 :Void;
+    pooling @4 :PoolingConfig;
+    sequential @5 :SequentialConfig;
+    softmax @6 :Void;
+    # Activation layers
+    relu @7 :Void;
+    sigmoid @8 :Void;
+    # Loss layers
+    negativeLogLikelihood @9 :NegativeLogLikelihoodConfig;
+    # Utility layers
+    reshape @10 :ReshapeConfig;
+  }
+
+  outputs @11 :List(Text);
+  inputs @12 :List(Text);
+  params @13 :List(WeightConfig);
+  propagateDown @14 :List(Bool);
+}
+
+# TODO: incomplete since WeightConfig isn't really used internally in Leaf.
+struct WeightConfig {
+  name @0 :Text;
+}
+
+struct ConvolutionConfig {
+  numOutput @0 :UInt64;
+  filterShape @1 :List(UInt64);
+  stride @2 :List(UInt64);
+  padding @3 :List(UInt64);
+}
+
+struct LinearConfig {
+  outputSize @0 :UInt64;
+}
+
+struct PoolingConfig {
+  mode @0 :PoolingMode;
+  filterShape @1 :List(UInt64);
+  stride @2 :List(UInt64);
+  padding @3 :List(UInt64);
+}
+
+enum PoolingMode {
+  max @0;
+  average @1; # not implemented yet, but we can't create a single variant enum so this is better than a meaningless "Dummy" value.
+}
+
+struct SequentialConfig {
+  layers @0 :List(LayerConfig);
+  inputs @1 :List(ShapedInput);
+  forceBackward @2 :Bool;
+}
+
+struct ShapedInput {
+  name @0 :Text;
+  shape @1 :List(UInt64);
+}
+
+struct NegativeLogLikelihoodConfig {
+  numClasses @0 :UInt64;
+}
+
+struct ReshapeConfig {
+  shape @0 :List(UInt64);
+}

src/capnp_util.rs

@@ -0,0 +1,9 @@
+//! Provides functionality for Cap'n Proto (de)serialization.
+
+pub trait CapnpWrite<'a> {
+    /// The Builder that was autogenerated by capnp.
+    type Builder;
+
+    /// Write the struct into the message that is being built by the Builder.
+    fn write_capnp(&self, builder: &mut Self::Builder);
+}