Added NaturalLanguageEncoder sketch

Sources/SwiftNLP/0. SNLP Internal Protocols/SNLPEncoder.swift

@@ -31,5 +31,6 @@ protocol SNLPEncoder : Codable {
             
     var defaultTokenEncoding: Value { get }
     
+    @inlinable
     func encode(token: Key) -> Value
 }

Sources/SwiftNLP/2. Encoding/NatualLanguageEncoder.swift

+// Copyright (c) 2024 Henry Tian, Jim Wallace
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#if canImport(NatualLanguage)
+import NaturalLanguage
+
+
+class NaturalLanguageEncoder<T>: SNLPEncoder where T: Collection & Codable, T.Element: BinaryFloatingPoint {
+    
+    typealias Key = String
+    typealias Value = [Float]
+    
+    var defaultTokenEncoding: [Float]
+    
+    @inlinable
+    func encode(token: String) -> [Float] {
+        if let embedding = NLEmbedding.wordEmbedding(for: .english) {
+            return embedding
+        }
+        return defaultTokenEncoding
+    }
+    
+}
+#endif