diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj b/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj
index 149956653b91a54cfefc23b8e24b4d5ae8306ee1..d3f8d02b819c66738ad8f7181ee5db44e02be2c0 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo.xcodeproj/project.pbxproj
@@ -44,6 +44,8 @@
 		FC9797C321D608E000F2FD90 /* mobilenet_params in Resources */ = {isa = PBXBuildFile; fileRef = FC9797C121D608DF00F2FD90 /* mobilenet_params */; };
 		FC9797C721D609FB00F2FD90 /* synset.txt in Resources */ = {isa = PBXBuildFile; fileRef = FC9797C621D609FB00F2FD90 /* synset.txt */; };
 		FC9797CF21D6506F00F2FD90 /* mingren.jpg in Resources */ = {isa = PBXBuildFile; fileRef = FC9797CE21D6506F00F2FD90 /* mingren.jpg */; };
+		FCAFD84B2231614200496A36 /* yolo_16_param in Resources */ = {isa = PBXBuildFile; fileRef = FCAFD8492231614200496A36 /* yolo_16_param */; };
+		FCAFD84C2231614200496A36 /* yolo_16_model in Resources */ = {isa = PBXBuildFile; fileRef = FCAFD84A2231614200496A36 /* yolo_16_model */; };
 		FCBCCC552122EF5500D94F7E /* MetalHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = FCBCCC542122EF5400D94F7E /* MetalHelper.swift */; };
 		FCC15E15221E716500DC3CB2 /* paddle-mobile-metallib.metallib in Resources */ = {isa = PBXBuildFile; fileRef = FCC15E14221E716400DC3CB2 /* paddle-mobile-metallib.metallib */; };
 		FCCED60521D7646E00BE8D5F /* test_image_super in Resources */ = {isa = PBXBuildFile; fileRef = FCCED60421D7646E00BE8D5F /* test_image_super */; };
@@ -114,6 +116,8 @@
 		FC9797C121D608DF00F2FD90 /* mobilenet_params */ = {isa = PBXFileReference; lastKnownFileType = file; path = mobilenet_params; sourceTree = "<group>"; };
 		FC9797C621D609FB00F2FD90 /* synset.txt */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text; path = synset.txt; sourceTree = "<group>"; };
 		FC9797CE21D6506F00F2FD90 /* mingren.jpg */ = {isa = PBXFileReference; lastKnownFileType = image.jpeg; path = mingren.jpg; sourceTree = "<group>"; };
+		FCAFD8492231614200496A36 /* yolo_16_param */ = {isa = PBXFileReference; lastKnownFileType = file; path = yolo_16_param; sourceTree = "<group>"; };
+		FCAFD84A2231614200496A36 /* yolo_16_model */ = {isa = PBXFileReference; lastKnownFileType = file; path = yolo_16_model; sourceTree = "<group>"; };
 		FCBCCC542122EF5400D94F7E /* MetalHelper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = MetalHelper.swift; sourceTree = "<group>"; };
 		FCC15E14221E716400DC3CB2 /* paddle-mobile-metallib.metallib */ = {isa = PBXFileReference; lastKnownFileType = "archive.metal-library"; name = "paddle-mobile-metallib.metallib"; path = "../../../../Library/Developer/Xcode/DerivedData/paddle-mobile-hdsimtkoxoondndnjczkbkchcwyh/Build/Products/Release-iphoneos/paddle-mobile-metallib.metallib"; sourceTree = "<group>"; };
 		FCCED60421D7646E00BE8D5F /* test_image_super */ = {isa = PBXFileReference; lastKnownFileType = file; path = test_image_super; sourceTree = "<group>"; };
@@ -263,6 +267,7 @@
 		FC704C1B21D237FC00F98BAB /* vision_model */ = {
 			isa = PBXGroup;
 			children = (
+				FCAFD8482231614200496A36 /* yolo_16 */,
 				FC704C1C21D237FC00F98BAB /* mobilenet */,
 				FC704C1F21D237FC00F98BAB /* yolo */,
 			);
@@ -322,6 +327,15 @@
 			path = mobilenet;
 			sourceTree = "<group>";
 		};
+		FCAFD8482231614200496A36 /* yolo_16 */ = {
+			isa = PBXGroup;
+			children = (
+				FCAFD8492231614200496A36 /* yolo_16_param */,
+				FCAFD84A2231614200496A36 /* yolo_16_model */,
+			);
+			path = yolo_16;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -388,6 +402,7 @@
 				FC039B8C20E11C560081E9F8 /* LaunchScreen.storyboard in Resources */,
 				FC9797CF21D6506F00F2FD90 /* mingren.jpg in Resources */,
 				FC704C2221D237FC00F98BAB /* combined_mobilenet_params in Resources */,
+				FCAFD84B2231614200496A36 /* yolo_16_param in Resources */,
 				FC704C1921D2375300F98BAB /* super_params in Resources */,
 				FC2BFCBE21DF15D900C262B2 /* 123.jpg in Resources */,
 				FC039B8920E11C560081E9F8 /* Assets.xcassets in Resources */,
@@ -397,6 +412,7 @@
 				FC704C1A21D2375300F98BAB /* super_model in Resources */,
 				FC039B8720E11C550081E9F8 /* Main.storyboard in Resources */,
 				FC9797C221D608E000F2FD90 /* mobilenet_model in Resources */,
+				FCAFD84C2231614200496A36 /* yolo_16_model in Resources */,
 				FC2BFCC021DF279900C262B2 /* classify-img-output.png in Resources */,
 				FC203FB221CBFDBA00B37166 /* test.jpg in Resources */,
 				FCC15E15221E716500DC3CB2 /* paddle-mobile-metallib.metallib in Resources */,
diff --git a/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift b/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift
index ae3449205e0bcf373a6237567c52c775b28cc7f1..54a5e465fd9e4e8840def865ae492157182b0973 100644
--- a/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift
+++ b/metal/paddle-mobile-demo/paddle-mobile-demo/Net/YoloNet.swift
@@ -20,12 +20,13 @@ public class YoloNet: Net {
     @objc public override init(device: MTLDevice) {
         super.init(device: device)
         except = 0
-        modelPath = Bundle.main.path(forResource: "yolo_model", ofType: nil) ?! "model null"
-        paramPath = Bundle.main.path(forResource: "yolo_params", ofType: nil) ?! "para null"
+        modelPath = Bundle.main.path(forResource: "yolo_16_model", ofType: nil) ?! "model null"
+        paramPath = Bundle.main.path(forResource: "yolo_16_param", ofType: nil) ?! "para null"
         inputDim = Dim.init(inDim: [1, 416, 416, 3])
         metalLoadMode = .LoadMetalInCustomMetalLib
         metalLibPath = Bundle.main.path(forResource: "paddle-mobile-metallib", ofType: "metallib")
-        useMPS = true
+        useMPS = false
+        paramPrecision = .Float16
     }
     
     override  public func resultStr(res: [ResultHolder]) -> String {
diff --git a/metal/paddle-mobile/paddle-mobile/API/GlobalConfig.swift b/metal/paddle-mobile/paddle-mobile/API/GlobalConfig.swift
index 220b0cea798ec89b8a2042f9d12679b7746be024..57b4f8201778d92d79f12c2fc6b43949660c8bcb 100644
--- a/metal/paddle-mobile/paddle-mobile/API/GlobalConfig.swift
+++ b/metal/paddle-mobile/paddle-mobile/API/GlobalConfig.swift
@@ -21,7 +21,7 @@ import Foundation
     LoadMetalInCustomMetalLib = 3      // 使用 metal 库文件
 }
 
-@objc public enum ComputePrecision: Int {
+@objc public enum Precision: Int {
     case
     Float32 = 1,
     Float16 = 2
@@ -33,7 +33,7 @@ import Foundation
     @objc public static let shared: GlobalConfig = GlobalConfig.init()
     
     /// 运算精度， runner 生命周期中不可变
-    @objc public var computePrecision: ComputePrecision = .Float16
+    @objc public var computePrecision: Precision = .Float16
     
     /// 是否开启 log
     @objc public var debug: Bool = false
diff --git a/metal/paddle-mobile/paddle-mobile/API/Net.swift b/metal/paddle-mobile/paddle-mobile/API/Net.swift
index 1b42ba0a4b561efc5322516f586906d34ad28e7a..35cd09eb49cde78a958ab019e69b03d4dfe35d0d 100644
--- a/metal/paddle-mobile/paddle-mobile/API/Net.swift
+++ b/metal/paddle-mobile/paddle-mobile/API/Net.swift
@@ -59,6 +59,9 @@ import Foundation
     /// 是否使用 MetalPerformanceShaders 进行运算
     @objc public var useMPS: Bool = false
     
+    /// 模型精度 - 当使用模型精度为 Float 16 时 不要开启 useMPS, 暂不支持
+    @objc public var paramPrecision: Precision = .Float32
+
     @objc public init(device: MTLDevice, inParamPointer: UnsafeMutableRawPointer, inParamSize:Int, inModelPointer: UnsafeMutableRawPointer, inModelSize: Int) {
         self.paramPointer = inParamPointer
         self.paramSize = inParamSize
diff --git a/metal/paddle-mobile/paddle-mobile/API/Runner.swift b/metal/paddle-mobile/paddle-mobile/API/Runner.swift
index 0b9ee0a679eae75ae173637bf968b616863f6ba6..a0c7ec68647b2e15b43b5e6ccd18d620cfed89dc 100644
--- a/metal/paddle-mobile/paddle-mobile/API/Runner.swift
+++ b/metal/paddle-mobile/paddle-mobile/API/Runner.swift
@@ -34,7 +34,7 @@ import Foundation
 
 @objc public class Runner: NSObject {
     var program: Program?
-    var executor: Executor<Float32>?
+    var executor: Executorable?
     var queue: MTLCommandQueue?
     var textureLoader: MTKTextureLoader?
     public let net: Net
@@ -68,7 +68,14 @@ import Foundation
             print(" paddle mobile gpu load error, need MTLCommandQueue")
             return false
         }
-        let loader = Loader<Float32>.init()
+        var loader: Loaderable
+        switch net.paramPrecision {
+        case .Float16:
+            loader = Loader<Float16>.init()
+        case .Float32:
+            loader = Loader<Float32>.init()
+        }
+        
         do {
             
             if let inParamPointer = net.paramPointer, let inModelPointer = net.modelPointer {
@@ -89,7 +96,13 @@ import Foundation
             initContext.metalLibPath = net.metalLibPath
             initContext.useMPS = net.useMPS
 
-            executor = try Executor<Float32>.init(inDevice: inDevice, inQueue: inQueue, inProgram: program!, initContext: initContext)
+            switch net.paramPrecision {
+            case .Float16:
+                executor = try Executor<Float16>.init(inDevice: inDevice, inQueue: inQueue, inProgram: program!, initContext: initContext)
+            case .Float32:
+                executor = try Executor<Float32>.init(inDevice: inDevice, inQueue: inQueue, inProgram: program!, initContext: initContext)
+            }
+            
             net.updateProgram(program: program!)
         } catch let error {
             print(error)
@@ -105,6 +118,7 @@ import Foundation
     ///   - completion: 结果回调， 当 success 为 true 时 result 不为 nil
     @objc public func predict(texture: MTLTexture, completion: @escaping ( _ success: Bool, _ result: [ResultHolder]?) -> Void) {
         do {
+            
             try self.executor?.predict(input: texture, dim: self.net.inputDim, completionHandle: { [weak self] (res) in
                 guard let SSelf = self else {
                     fatalError( " self nil " )
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Common/MetalExtension.swift b/metal/paddle-mobile/paddle-mobile/Src/Common/MetalExtension.swift
index 35fffb52ec2364adda2c9a9cd70b7d7ff3cf6f2e..3af3a75a64fa64b5cc482c24925c762cec38a925 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Common/MetalExtension.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Common/MetalExtension.swift
@@ -254,7 +254,7 @@ extension MTLDevice {
         return tensor
     }
     
-    func tensor2texture<P>(value: [P], dim: [Int], transpose: [Int] = [0, 1, 2, 3], inComputePrecision: ComputePrecision = .Float32) -> MTLTexture {
+    func tensor2texture<P>(value: [P], dim: [Int], transpose: [Int] = [0, 1, 2, 3], inComputePrecision: Precision = .Float32) -> MTLTexture {
         if value.count > 0 {
             assert(value.count == dim.reduce(1) { $0 * $1 })
         }
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Common/Tools.swift b/metal/paddle-mobile/paddle-mobile/Src/Common/Tools.swift
index 23ad7113971de3d0843abe17accfe3d67f0caaa9..6128aa87768aaefddb782cf29ce0056a67284b37 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Common/Tools.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Common/Tools.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-func writeToLibrary<P: PrecisionType>(fileName: String, array: [P]) {
+func writeToLibrary<P: PrecisionProtocol>(fileName: String, array: [P]) {
     let libraryPath = NSSearchPathForDirectoriesInDomains(.libraryDirectory, .userDomainMask, true).last ?! " library path get error "
     let filePath = libraryPath + "/" + fileName
     let fileManager = FileManager.init()
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Common/Types.swift b/metal/paddle-mobile/paddle-mobile/Src/Common/Types.swift
index 701bb37bf2442ff30f372d420670ca6f4f7fc85e..21a9f4385d7205c02414634e042c1e958d1ab120 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Common/Types.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Common/Types.swift
@@ -20,20 +20,28 @@ public protocol SummableMultipliable: Equatable {
     static func *(lhs: Self, rhs: Self) -> Self
     static func -(lhs: Self, rhs: Self) -> Self
 }
-public protocol PrecisionType: SummableMultipliable{
+
+public protocol PrecisionProtocol: SummableMultipliable{
     init(inFloat: Float32)
     init(inFloat16: Float16)
-    init<P: PrecisionType>(_ inP: P)
+    init<P: PrecisionProtocol>(_ inP: P)
     static var bitSize: UInt { get }
+    static func initializeValue() -> Self
+    static var precisionType: Precision { get }
 }
 
 public typealias Float16 = Int16
-extension Float16: PrecisionType {
-    public static func * (prefix: Float16, postfix: Float16) {
-        return prefix * postfix
+extension Float16: PrecisionProtocol {
+    
+    public static var precisionType: Precision {
+        return .Float16
     }
     
-    public init<P>(_ inP: P) where P : PrecisionType {
+    public static func initializeValue() -> Int16 {
+        return 0
+    }
+    
+    public init<P>(_ inP: P) where P : PrecisionProtocol {
         if P.bitSize == Float32.bitSize {
             self = Float16(inFloat: inP as! Float32)
         } else if P.bitSize == Float16.bitSize {
@@ -55,8 +63,17 @@ extension Float16: PrecisionType {
     }
 }
 
-extension Float32: PrecisionType {
-    public init<P>(_ inP: P) where P : PrecisionType {
+extension Float32: PrecisionProtocol {
+    
+    public static var precisionType: Precision {
+        return .Float32
+    }
+    
+    public static func initializeValue() -> Float {
+        return 0.0
+    }
+    
+    public init<P>(_ inP: P) where P : PrecisionProtocol {
         if P.bitSize == Float32.bitSize {
             self = inP as! Float32
         } else if P.bitSize == Float16.bitSize {
@@ -116,80 +133,6 @@ struct DataLayout {
         return layoutWithDim.count
     }
     
-    var N: Int? {
-        get {
-            for layoutDim in layoutWithDim {
-                if layoutDim.0 == .N {
-                    return layoutDim.1
-                }
-            }
-            return nil
-        }
-        set {
-            var newN = (Layout.N, newValue)
-            if let index = layoutWithDim.index(where: { (layout: Layout, dim: Int) -> Bool in
-                return layout == .N
-            }) {
-                fatalError()
-            }
-        }
-    }
-    var C: Int? {
-        get {
-            for layoutDim in layoutWithDim {
-                if layoutDim.0 == .C {
-                    return layoutDim.1
-                }
-            }
-            return nil
-        }
-        set {
-            var newN = (Layout.C, newValue)
-            if let index = layoutWithDim.index(where: { (layout: Layout, dim: Int) -> Bool in
-                return layout == .N
-            }) {
-                fatalError()
-            }
-        }
-    }
-    var H: Int? {
-        get {
-            for layoutDim in layoutWithDim {
-                if layoutDim.0 == .H {
-                    return layoutDim.1
-                }
-            }
-            return nil
-        }
-        set {
-            var newN = (Layout.H, newValue)
-            if let index = layoutWithDim.index(where: { (layout: Layout, dim: Int) -> Bool in
-                return layout == .H
-            }) {
-                fatalError()
-            }
-        }
-    }
-    var W: Int? {
-        get {
-            for layoutDim in layoutWithDim {
-                if layoutDim.0 == .W {
-                    return layoutDim.1
-                }
-            }
-            return nil
-        }
-        set {
-            var newN = (Layout.W, newValue)
-            if let index = layoutWithDim.index(where: { (layout: Layout, dim: Int) -> Bool in
-                return layout == .W
-            }) {
-                fatalError()
-            }
-        }
-    }
-    
-    
     init(_ inLayout: [(Layout, Int)]) {
         layoutWithDim = inLayout
     }
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Framework/Executor.swift b/metal/paddle-mobile/paddle-mobile/Src/Framework/Executor.swift
index 0b6b17205f7450f29f6d5428272e0ca40af4673a..fa86c463e62e6e4dda5150885788b175f9be7b5a 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Framework/Executor.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Framework/Executor.swift
@@ -41,7 +41,12 @@ var isTest = false
     
 }
 
-public class Executor<P: PrecisionType> {
+protocol Executorable {
+    func predict(input: MTLTexture, dim: Dim, completionHandle: @escaping ([GPUResultHolder]) -> Void, preProcessKernle: CusomKernel?, except: Int) throws
+    func clear()
+}
+
+public class Executor<P: PrecisionProtocol>: Executorable{
     var ops: [Runable & InferShaperable] = []
     var preInputDim: Dim = Dim.init(inDim: [])
     let program: Program
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Framework/Loader.swift b/metal/paddle-mobile/paddle-mobile/Src/Framework/Loader.swift
index 790b961480982157da2ba4737442285c3676a2ef..c437d284ccff5fd76d4bda26bc011083a8aeb998 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Framework/Loader.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Framework/Loader.swift
@@ -15,7 +15,12 @@
 import Foundation
 //import SwiftProtobuf
 
-public class Loader<P: PrecisionType> {
+protocol Loaderable {
+    func load(device:MTLDevice, paramPointer: UnsafeMutableRawPointer, paramSize:Int, modePointer: UnsafeMutableRawPointer, modelSize: Int) throws -> Program
+    func load(device: MTLDevice, modelPath: String, paraPath: String) throws -> Program
+}
+
+public class Loader<P: PrecisionProtocol>: Loaderable{
     class ParaLoader {
         let file: UnsafeMutablePointer<FILE>
         let fileSize: Int
@@ -143,7 +148,7 @@ public class Loader<P: PrecisionType> {
         }
     }
     public init(){}
-    func loadModelandParam(_ device:MTLDevice,_ modelData:Data, _ paraLoaderPointer:ParaLoaderWithPointer?, _ paraLoader:ParaLoader?) throws -> Program {
+    private func loadModelandParam(_ device:MTLDevice,_ modelData:Data, _ paraLoaderPointer:ParaLoaderWithPointer?, _ paraLoader:ParaLoader?) throws -> Program {
         do {
             /// swift protobuf serialized Data to instance class
             //      let protoProgram = try PaddleMobile_Framework_Proto_ProgramDesc.init(
@@ -248,7 +253,7 @@ public class Loader<P: PrecisionType> {
         }
     }
     
-    public func load(device: MTLDevice, modelPath: String, paraPath: String) throws -> Program{
+    public func load(device: MTLDevice, modelPath: String, paraPath: String) throws -> Program {
         guard let modelData = try? Data.init(contentsOf: URL.init(fileURLWithPath: modelPath)) else {
             throw PaddleMobileError.loaderError(message: "load " + modelPath + " failed !")
         }
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Framework/Tensor.swift b/metal/paddle-mobile/paddle-mobile/Src/Framework/Tensor.swift
index 298f2ce420a2285d0365abea47b524119c138c6c..b1121875c8071f6f5e16ce1c0be94bcba6b4627e 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Framework/Tensor.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Framework/Tensor.swift
@@ -28,7 +28,7 @@ extension Tensorial {
     }
 }
 
-class DataConverter<P: PrecisionType> {
+class DataConverter<P: PrecisionProtocol> {
     func convert(from: UnsafeMutablePointer<P>, to: UnsafeMutablePointer<P>, fromDim: Dim) {
         fatalError(" need imp")
     }
@@ -40,7 +40,7 @@ class DataConverter<P: PrecisionType> {
 
 /// [ outputChannels ][ inputChannels ][ kernelHeight ][ kernelWidth ] ->
 /// [ outputChannels ][ kernelHeight ][ kernelWidth ][ inputChannels ]
-class MPSPointerConverter<P: PrecisionType>: DataConverter<P>{
+class MPSPointerConverter<P: PrecisionProtocol>: DataConverter<P>{
     
     /// [ outputChannels ][ inputChannels ][ kernelHeight ][ kernelWidth ] ->
     /// [ outputChannels ][ kernelHeight ][ kernelWidth ][ inputChannels ]
@@ -81,7 +81,7 @@ class MPSPointerConverter<P: PrecisionType>: DataConverter<P>{
     }
 }
 
-class Tensor<P: PrecisionType>: Tensorial {
+class Tensor<P: PrecisionProtocol>: Tensorial {
     
     var data: Data
     var dim: Dim
@@ -169,14 +169,15 @@ class Tensor<P: PrecisionType>: Tensorial {
         layout = to
     }
     
-    
-    
-    func initBuffer(device: MTLDevice, precision: ComputePrecision = .Float16, padWhenOneC: Bool = false, convertToNHWC: Bool = true, withTranspose: Bool = false) {
+    func initBuffer(device: MTLDevice, precision computePrecision: Precision = .Float16, padWhenOneC: Bool = false, convertToNHWC: Bool = true, withTranspose: Bool = false) {
         if convertToNHWC {
-            //      print(layout)
             convert(to: DataLayout.NHWC())
         }
         
+        if P.precisionType == .Float16 && computePrecision == .Float32{
+            fatalError(" 不支持: 16位模型不能按照 32 位进行运算")
+        }
+        
         if withTranspose {
             let transposePointer = UnsafeMutablePointer<P>.allocate(capacity: numel())
             let n = dim[0]
@@ -193,12 +194,8 @@ class Tensor<P: PrecisionType>: Tensorial {
             data = Data.init(inCount: data.count, inPointer: transposePointer)
         }
         
-        guard let floatPointer = data.pointer as? UnsafeMutablePointer<Float32> else {
-            fatalError(" not support yet ")
-        }
-        
         let precisionSize: Int
-        switch precision {
+        switch computePrecision {
         case .Float32:
             precisionSize = 4
         case .Float16:
@@ -213,44 +210,58 @@ class Tensor<P: PrecisionType>: Tensorial {
                 let count = paddedC * dim[0] * dim[1] * dim[2]
                 if C == paddedC {
                     buffer = device.makeBuffer(length: count * precisionSize)
-                    switch precision {
-                    case .Float32:
-                        buffer?.contents().copyMemory(from: data.pointer, byteCount: count * MemoryLayout<P>.stride)
+                    switch P.precisionType {
                     case .Float16:
-                        float32ToFloat16(input: floatPointer, output: buffer.contents(), count: count)
+                        buffer?.contents().copyMemory(from: data.pointer, byteCount: count * MemoryLayout<P>.stride)
+                    case .Float32:
+                        switch computePrecision {
+                        case .Float32:
+                            buffer?.contents().copyMemory(from: data.pointer, byteCount: count * MemoryLayout<P>.stride)
+                        case .Float16:
+                            float32ToFloat16(input: data.pointer as! UnsafeMutablePointer<Float32>, output: buffer.contents(), count: count)
+                        }
                     }
                 } else if C == 1 && !padWhenOneC {
                     buffer = device.makeBuffer(length: numel() * precisionSize)
-                    switch precision {
-                    case .Float32:
-                        buffer?.contents().copyMemory(from: data.pointer, byteCount: numel() * MemoryLayout<P>.stride)
+                    switch P.precisionType {
                     case .Float16:
-                        float32ToFloat16(input: floatPointer, output: buffer.contents(), count: numel())
+                        buffer?.contents().copyMemory(from: data.pointer, byteCount: numel() * MemoryLayout<P>.stride)
+                    case .Float32:
+                        switch computePrecision {
+                        case .Float32:
+                            buffer?.contents().copyMemory(from: data.pointer, byteCount: numel() * MemoryLayout<P>.stride)
+                        case .Float16:
+                            float32ToFloat16(input: data.pointer as! UnsafeMutablePointer<Float32>, output: buffer.contents(), count: numel())
+                        }
                     }
                 } else {
                     buffer = device.makeBuffer(length: count * precisionSize)
-                    let convertedPointer = UnsafeMutablePointer<Float32>.allocate(capacity: count)
-                    var tmpPointer = floatPointer
+                    let convertedPointer = UnsafeMutablePointer<P>.allocate(capacity: count)
+                    var tmpPointer = data.pointer
                     var dstPtr = convertedPointer
                     for _ in 0..<dim[0] * dim[1] * dim[2] {
                         for j in 0..<paddedC {
                             if j < C {
                                 dstPtr[j] = tmpPointer[j]
                             } else {
-                                dstPtr[j] = 0
+                                dstPtr[j] = P.initializeValue()
                             }
                         }
                         tmpPointer += C
                         dstPtr += paddedC
                     }
                     
-                    switch precision {
-                    case .Float32:
-                        buffer?.contents().copyMemory(from: convertedPointer, byteCount: count * MemoryLayout<P>.stride)
+                    switch P.precisionType {
                     case .Float16:
-                        float32ToFloat16(input: convertedPointer, output: buffer.contents(), count: count)
+                        buffer?.contents().copyMemory(from: convertedPointer, byteCount: count * MemoryLayout<P>.stride)
+                    case .Float32:
+                        switch computePrecision {
+                        case .Float32:
+                            buffer?.contents().copyMemory(from: convertedPointer, byteCount: count * MemoryLayout<P>.stride)
+                        case .Float16:
+                            float32ToFloat16(input: convertedPointer as! UnsafeMutablePointer<Float32>, output: buffer.contents(), count: count)
+                        }
                     }
-                    
                     convertedPointer.deinitialize(count: count)
                     convertedPointer.deallocate()
                 }
@@ -261,36 +272,46 @@ class Tensor<P: PrecisionType>: Tensorial {
                 let count = paddedC * dim[0] * dim[1] * dim[2]
                 if C == paddedC {
                     buffer = device.makeBuffer(length: count * precisionSize)
-                    switch precision {
-                    case .Float32:
-                        buffer?.contents().copyMemory(from: data.pointer, byteCount: count * MemoryLayout<P>.stride)
+                    switch P.precisionType {
                     case .Float16:
-                        float32ToFloat16(input: floatPointer, output: buffer.contents(), count: count)
+                        buffer?.contents().copyMemory(from: data.pointer, byteCount: count * MemoryLayout<P>.stride)
+                    case .Float32:
+                        switch computePrecision {
+                        case .Float32:
+                            buffer?.contents().copyMemory(from: data.pointer, byteCount: count * MemoryLayout<P>.stride)
+                        case .Float16:
+                            float32ToFloat16(input: data.pointer as! UnsafeMutablePointer<Float32>, output: buffer.contents(), count: count)
+                        }
                     }
                 } else if C == 1 {
                     fatalError(" not support ")
                 } else {
                     buffer = device.makeBuffer(length: count * precisionSize)
-                    let convertedPointer = UnsafeMutablePointer<Float32>.allocate(capacity: count)
-                    var tmpPointer = floatPointer
+                    let convertedPointer = UnsafeMutablePointer<P>.allocate(capacity: count)
+                    var tmpPointer = data.pointer
                     var dstPtr = convertedPointer
                     for _ in 0..<dim[0] * dim[1] * dim[2] {
                         for j in 0..<paddedC {
                             if j < C {
                                 dstPtr[j] = tmpPointer[j]
                             } else {
-                                dstPtr[j] = 0
+                                dstPtr[j] = P.initializeValue()
                             }
                         }
                         tmpPointer += C
                         dstPtr += paddedC
                     }
                     
-                    switch precision {
-                    case .Float32:
+                    switch P.precisionType {
+                    case .Float16: // 模型精度为 32 位
                         buffer?.contents().copyMemory(from: convertedPointer, byteCount: count * MemoryLayout<P>.stride)
-                    case .Float16:
-                        float32ToFloat16(input: convertedPointer, output: buffer.contents(), count: count)
+                    case .Float32: // 模型精度为 16 位
+                        switch computePrecision {
+                        case .Float32:
+                            buffer?.contents().copyMemory(from: convertedPointer, byteCount: count * MemoryLayout<P>.stride)
+                        case .Float16:
+                            float32ToFloat16(input: convertedPointer as! UnsafeMutablePointer<Float32>, output: buffer.contents(), count: count)
+                        }
                     }
                     convertedPointer.deinitialize(count: count)
                     convertedPointer.deallocate()
@@ -299,11 +320,17 @@ class Tensor<P: PrecisionType>: Tensorial {
         } else if dim.cout() == 1 {
             let num = ((numel() + 3) / 4) * 4
             buffer = device.makeBuffer(length: num * precisionSize)
-            switch precision {
-            case .Float32:
-                buffer?.contents().copyMemory(from: data.pointer, byteCount: num * MemoryLayout<P>.stride)
+            
+            switch P.precisionType {
             case .Float16:
-                float32ToFloat16(input: floatPointer, output: buffer.contents(), count: num)
+                buffer?.contents().copyMemory(from: data.pointer, byteCount: num * MemoryLayout<P>.stride)
+            case .Float32:
+                switch computePrecision {
+                case .Float32:
+                    buffer?.contents().copyMemory(from: data.pointer, byteCount: num * MemoryLayout<P>.stride)
+                case .Float16:
+                    float32ToFloat16(input: data.pointer as! UnsafeMutablePointer<Float32>, output: buffer.contents(), count: num)
+                }
             }
         } else {
             fatalError(" not support !")
@@ -404,7 +431,7 @@ extension Tensor {
     
     var debugDescription: String {
         var str = "dim: \(dim) \n"
-        str += "MTLBuffer: \(self.buffer) \n"
+        str += "MTLBuffer: \(self.buffer.description) \n"
         for i in 0..<buffer.length/MemoryLayout<P>.size {
             str += " \(buffer.contents().assumingMemoryBound(to: P.self)[i])"
         }
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Framework/Texture.swift b/metal/paddle-mobile/paddle-mobile/Src/Framework/Texture.swift
index cc1ed05e121524fec9ff35ce1df3d2c54b4a8c88..72195a22ea5fdde4f8c813c5c4863a9b9850e7f2 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Framework/Texture.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Framework/Texture.swift
@@ -96,7 +96,7 @@ public class Texture: Tensorial {
         return metalTexture.realNHWC(dim: (n: padToFourDim[0], h: padToFourDim[1], w: padToFourDim[2], c: padToFourDim[3]))
     }
     
-    public func initTexture(device: MTLDevice, inTranspose: [Int] = [0, 1, 2, 3], computePrecision: ComputePrecision = .Float16) {
+    public func initTexture(device: MTLDevice, inTranspose: [Int] = [0, 1, 2, 3], computePrecision: Precision = .Float16) {
         transpose = inTranspose
         for i in 0..<(4 - tensorDim.cout()) {
             if i != inTranspose[i] {
@@ -196,7 +196,7 @@ extension Texture {
     public var debugDescription: String{
         var str = ""
         str += "Dim: \(dim) \n value:[ "
-        str += "\(metalTexture)"
+        str += "\(metalTexture.description)"
         str += " ]"
         return str
     }
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpCreator.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpCreator.swift
index f16344e5005fd678e07a0bf2dc7e115cb5d469a9..a2f4104b9bf3d42b1c9aba06278b314409088d69 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpCreator.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpCreator.swift
@@ -15,7 +15,7 @@
 import Foundation
 
 fileprivate var singletons : [String : Any] = [:]
-class OpCreator<P: PrecisionType> {
+class OpCreator<P: PrecisionProtocol> {
     static var shared : OpCreator<P> {
         let key = String(describing: P.self)
         if let singleton = singletons[key] {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpParam.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpParam.swift
index 0af90e411b9d1c7f7d2bebd990de24839ecd58c4..37a847b7501ee93c2a9296957725a15594d8801f 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpParam.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Base/OpParam.swift
@@ -26,7 +26,7 @@ protocol OpParam {
     var output: OutputType { get set }
     func outputDesc() -> String
     
-    //associatedtype ParamPrecisionType: PrecisionType
+    //associatedtype ParamPrecisionType: PrecisionProtocol
     init(opDesc: PMOpDesc, inScope: Scope) throws
     static func getFirstTensor<VarType: Variant>(key: String, map: [String : [String]], from: Scope) throws -> VarType
     static func inputX<VarType: Variant>(inputs: [String : [String]], from: Scope) throws -> VarType
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/BatchNormOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/BatchNormOp.swift
index 904e04c468e8b85c2b5d4c01ea828c10444c4692..7e53ea8d1cdd211fa377acb0438b17697685a78b 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/BatchNormOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/BatchNormOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class BatchNormParam<P: PrecisionType>: OpParam {
+class BatchNormParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -44,7 +44,7 @@ class BatchNormParam<P: PrecisionType>: OpParam {
     let momentum: Float
 }
 
-class BatchNormOp<P: PrecisionType>: Operator<BatchNormKernel<P>, BatchNormParam<P>>, Runable, Creator, InferShaperable{
+class BatchNormOp<P: PrecisionProtocol>: Operator<BatchNormKernel<P>, BatchNormParam<P>>, Runable, Creator, InferShaperable{
     typealias OpType = BatchNormOp<P>
     
     func inferShape() {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/BilinearInterpOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/BilinearInterpOp.swift
index e44a49d9004ea9260ff32881b810fbd294d00d29..51703c3e6fd07d6031bda497cf04e79dfc9aa1fe 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/BilinearInterpOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/BilinearInterpOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class BilinearInterpParam<P: PrecisionType>: OpParam {
+class BilinearInterpParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -36,7 +36,7 @@ class BilinearInterpParam<P: PrecisionType>: OpParam {
     let out_w: Int
 }
 
-class BilinearInterpOp<P: PrecisionType>: Operator<BilinearInterpKernel<P>, BilinearInterpParam<P>>, Runable, Creator, InferShaperable{
+class BilinearInterpOp<P: PrecisionProtocol>: Operator<BilinearInterpKernel<P>, BilinearInterpParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = BilinearInterpOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/BoxcoderOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/BoxcoderOp.swift
index 442d1af9ea4629e56979ad970dfbaf85f497d3b6..0ca6325922b4d1da2b3e1772503616482f6831d4 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/BoxcoderOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/BoxcoderOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class BoxcoderParam<P: PrecisionType>: OpParam {
+class BoxcoderParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -45,7 +45,7 @@ class BoxcoderParam<P: PrecisionType>: OpParam {
     let boxNormalized: Bool
 }
 
-class BoxcoderOp<P: PrecisionType>: Operator<BoxcoderKernel<P>, BoxcoderParam<P>>, Runable, Creator, InferShaperable{
+class BoxcoderOp<P: PrecisionProtocol>: Operator<BoxcoderKernel<P>, BoxcoderParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = BoxcoderOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConcatOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConcatOp.swift
index a8034c681fd8677138fec6fc818be73f3fd8411e..e526bf05db4e54cd48a3728b47d2ae31042e3499 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConcatOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConcatOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConcatParam<P: PrecisionType>: OpParam {
+class ConcatParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -46,7 +46,7 @@ class ConcatParam<P: PrecisionType>: OpParam {
     let axis: Int
 }
 
-class ConcatOp<P: PrecisionType>: Operator<ConcatKernel<P>, ConcatParam<P>>, Runable, Creator, InferShaperable{
+class ConcatOp<P: PrecisionProtocol>: Operator<ConcatKernel<P>, ConcatParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = ConcatOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddAddPreluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddAddPreluOp.swift
index e7865045e5485721c5c4137fa8a8be0e7b8680e4..f22a0026d3a941942feffe5781958727f4f76601 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddAddPreluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddAddPreluOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class ConvAddAddPreluParam<P: PrecisionType>: OpParam {
+class ConvAddAddPreluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -46,7 +46,7 @@ class ConvAddAddPreluParam<P: PrecisionType>: OpParam {
     let groups: Int
 }
 
-class ConvAddAddPreluOp<P: PrecisionType>: Operator<ConvAddAddPreluKernel<P>, ConvAddAddPreluParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class ConvAddAddPreluOp<P: PrecisionProtocol>: Operator<ConvAddAddPreluKernel<P>, ConvAddAddPreluParam<P>>, Runable, Creator, InferShaperable, Fusion{
     typealias OpType = ConvAddAddPreluOp<P>
     
     static func fusionNode() -> Node {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddBatchNormReluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddBatchNormReluOp.swift
index 311967c22cf0918e7cde986e72834a244516f85c..dd08da27ace558fad3405067b67002343f2c55a9 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddBatchNormReluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddBatchNormReluOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 
 
-class ConvAddBatchNormReluParam<P: PrecisionType>: OpParam {
+class ConvAddBatchNormReluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -59,7 +59,7 @@ class ConvAddBatchNormReluParam<P: PrecisionType>: OpParam {
     let groups: Int
 }
 
-class ConvAddBatchNormReluOp<P: PrecisionType>: Operator<ConvAddBatchNormReluKernel<P>, ConvAddBatchNormReluParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class ConvAddBatchNormReluOp<P: PrecisionProtocol>: Operator<ConvAddBatchNormReluKernel<P>, ConvAddBatchNormReluParam<P>>, Runable, Creator, InferShaperable, Fusion{
     
     typealias OpType = ConvAddBatchNormReluOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddOp.swift
index 7b9958a0666b619de46ee15935233a45e81585dd..c24441f7f34956629774cab951819d89c09a1c41 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvAddParam<P: PrecisionType>: OpParam {
+class ConvAddParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -43,7 +43,7 @@ class ConvAddParam<P: PrecisionType>: OpParam {
     let groups: Int
 }
 
-class ConvAddOp<P: PrecisionType>: Operator<ConvAddKernel<P>, ConvAddParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class ConvAddOp<P: PrecisionProtocol>: Operator<ConvAddKernel<P>, ConvAddParam<P>>, Runable, Creator, InferShaperable, Fusion{
     typealias OpType = ConvAddOp<P>
     
     static func fusionNode() -> Node {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddPreluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddPreluOp.swift
index dc3205622484d43b86bd0371043ead45df87534a..03cbeb8187377bd4974d2d6c6d95a693c07b41c0 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddPreluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvAddPreluOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvAddPreluParam<P: PrecisionType>: OpParam {
+class ConvAddPreluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -45,7 +45,7 @@ class ConvAddPreluParam<P: PrecisionType>: OpParam {
     let groups: Int
 }
 
-class ConvAddPreluOp<P: PrecisionType>: Operator<ConvAddPreluKernel<P>, ConvAddPreluParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class ConvAddPreluOp<P: PrecisionProtocol>: Operator<ConvAddPreluKernel<P>, ConvAddPreluParam<P>>, Runable, Creator, InferShaperable, Fusion{
     typealias OpType = ConvAddPreluOp<P>
     
     static func fusionNode() -> Node {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvBNReluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvBNReluOp.swift
index 1a973c51ef32e85d699b39eae55ce7afbc06c720..adbad35b4755f0c093a8f9c49f4c879a91265f8e 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvBNReluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvBNReluOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvBNReluParam<P: PrecisionType>: OpParam {
+class ConvBNReluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -53,7 +53,7 @@ class ConvBNReluParam<P: PrecisionType>: OpParam {
     let groups: Int
 }
 
-class ConvBNReluOp<P: PrecisionType>: Operator<ConvBNReluKernel<P>, ConvBNReluParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class ConvBNReluOp<P: PrecisionProtocol>: Operator<ConvBNReluKernel<P>, ConvBNReluParam<P>>, Runable, Creator, InferShaperable, Fusion{
     typealias OpType = ConvBNReluOp<P>
     
     func inputs() -> [Variant] {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvOp.swift
index 2d402ae4316d50cf47e648ac9485bac75f47161e..93ddb53bc92cf96447aee39a6b9762b42ef79b26 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvParam<P: PrecisionType>: OpParam {
+class ConvParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -40,7 +40,7 @@ class ConvParam<P: PrecisionType>: OpParam {
     let groups: Int
 }
 
-class ConvOp<P: PrecisionType>: Operator<ConvKernel<P>, ConvParam<P>>, Runable, Creator, InferShaperable {
+class ConvOp<P: PrecisionProtocol>: Operator<ConvKernel<P>, ConvParam<P>>, Runable, Creator, InferShaperable {
     typealias OpType = ConvOp<P>
     
     func inferShape() {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvTransposeOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvTransposeOp.swift
index 8322263e7c6e558d2e05493dc619c6ebe29fe2e7..57269354a11a8006b34eacb17b560f587d8c259f 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvTransposeOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ConvTransposeOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvTransposeParam<P: PrecisionType>: ConvParam<P> {
+class ConvTransposeParam<P: PrecisionProtocol>: ConvParam<P> {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -25,7 +25,7 @@ class ConvTransposeParam<P: PrecisionType>: ConvParam<P> {
     }
 }
 
-class ConvTransposeOp<P: PrecisionType>: Operator<ConvTransposeKernel<P>, ConvTransposeParam<P>>, Runable, Creator, InferShaperable{
+class ConvTransposeOp<P: PrecisionProtocol>: Operator<ConvTransposeKernel<P>, ConvTransposeParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = ConvTransposeOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/DepthwiseConvOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/DepthwiseConvOp.swift
index 4686501fddda1cfe7e15680af6b3984381d842cb..49e146b688e626e87d6641e6271e20b6109cc98e 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/DepthwiseConvOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/DepthwiseConvOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class DepthConvOp<P: PrecisionType>: Operator<ConvKernel<P>, ConvParam<P>>, Runable, Creator, InferShaperable {
+class DepthConvOp<P: PrecisionProtocol>: Operator<ConvKernel<P>, ConvParam<P>>, Runable, Creator, InferShaperable {
     
     typealias OpType = DepthConvOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/DwConvBNReluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/DwConvBNReluOp.swift
index ef3bc21316126c6902eb5086c2aaf79743aac4f7..dd3f50c5d41685d043e07c522879f79cff08b76a 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/DwConvBNReluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/DwConvBNReluOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class DwConvBNReluOp<P: PrecisionType>: Operator<ConvBNReluKernel<P>, ConvBNReluParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class DwConvBNReluOp<P: PrecisionProtocol>: Operator<ConvBNReluKernel<P>, ConvBNReluParam<P>>, Runable, Creator, InferShaperable, Fusion{
     typealias OpType = ConvBNReluOp<P>
     
     func inferShape() {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddOp.swift
index cd5307b5840b2cb756d132f3e60c21b7fe86f484..73a278e3c72460398c2aa17f39d67a7b7a37338d 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class ElementwiseAddParam<P: PrecisionType>: OpParam {
+class ElementwiseAddParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -61,7 +61,7 @@ class ElementwiseAddParam<P: PrecisionType>: OpParam {
     var axis: Int
 }
 
-class ElementwiseAddOp<P: PrecisionType>: Operator<ElementwiseAddKernel<P>, ElementwiseAddParam<P>>, Runable, Creator, InferShaperable{
+class ElementwiseAddOp<P: PrecisionProtocol>: Operator<ElementwiseAddKernel<P>, ElementwiseAddParam<P>>, Runable, Creator, InferShaperable{
     typealias OpType = ElementwiseAddOp<P>
     
     func inferShape() {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddPreluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddPreluOp.swift
index bd853f6c0f5b209da21f9965b30726d0703f11df..bcf0ba994ca48b6af18533f36718c1d458239e8e 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddPreluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ElementwiseAddPreluOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class ElementwiseAddPreluParam<P: PrecisionType>: OpParam {
+class ElementwiseAddPreluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -65,7 +65,7 @@ class ElementwiseAddPreluParam<P: PrecisionType>: OpParam {
     var axis: Int
 }
 
-class ElementwiseAddPreluOp<P: PrecisionType>: Operator<ElementwiseAddPreluKernel<P>, ElementwiseAddPreluParam<P>>, Runable, Creator, InferShaperable, Fusion{
+class ElementwiseAddPreluOp<P: PrecisionProtocol>: Operator<ElementwiseAddPreluKernel<P>, ElementwiseAddPreluParam<P>>, Runable, Creator, InferShaperable, Fusion{
     static func fusionNode() -> Node {
         let beginNode = Node.init(inType: gElementwiseAddType)
         _ = beginNode
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/FeedOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/FeedOp.swift
index bab3d8dce740291138a4f328907d521bf132e2bf..0d9510d2b0353890c517c6ece71b60635a10eaf0 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/FeedOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/FeedOp.swift
@@ -16,7 +16,7 @@ import Foundation
 import MetalKit
 import CoreMedia
 
-class FeedParam<P: PrecisionType>: OpParam{
+class FeedParam<P: PrecisionProtocol>: OpParam{
     var output: Texture
     var input: InputTexture {
         return scope.input() as! InputTexture
@@ -35,7 +35,7 @@ class FeedParam<P: PrecisionType>: OpParam{
     //typealias ParamPrecisionType = P
 }
 
-class FeedOp<P: PrecisionType>: Operator<Texture2DTo2DArrayKernel<P>, FeedParam<P>>, Runable, Creator, InferShaperable {
+class FeedOp<P: PrecisionProtocol>: Operator<Texture2DTo2DArrayKernel<P>, FeedParam<P>>, Runable, Creator, InferShaperable {
     typealias OpType = FeedOp<P>
     
     func inferShape() {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/FetchOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/FetchOp.swift
index 671c2f33faa29620cf423166b0f6f71849a66e67..e9a5a395aed840d37e29ea1dec16b34085d80624 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/FetchOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/FetchOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class FetchParam<P: PrecisionType>: OpParam{
+class FetchParam<P: PrecisionProtocol>: OpParam{
     var output: FetchHolder
     let input: Texture
     let scope: Scope
@@ -33,7 +33,7 @@ class FetchParam<P: PrecisionType>: OpParam{
     //typealias ParamPrecisionType = P
 }
 
-class FetchOp<P: PrecisionType>: Operator< FetchKernel<P>, FetchParam<P>>, Runable, Creator, InferShaperable {
+class FetchOp<P: PrecisionProtocol>: Operator< FetchKernel<P>, FetchParam<P>>, Runable, Creator, InferShaperable {
     
     typealias OpType = FetchOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/FlattenOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/FlattenOp.swift
index b98299085167f7cb5dbf090d7cc48f6e779a2294..f5d100494835a6980a3604914010797b1d6c0198 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/FlattenOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/FlattenOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class FlattenParam<P: PrecisionType>: OpParam {
+class FlattenParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -31,7 +31,7 @@ class FlattenParam<P: PrecisionType>: OpParam {
 }
 
 
-class FlattenOp<P: PrecisionType>: Operator<FlattenKernel<P>, FlattenParam<P>>, Runable, Creator, InferShaperable{
+class FlattenOp<P: PrecisionProtocol>: Operator<FlattenKernel<P>, FlattenParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = FlattenOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BatchNormKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BatchNormKernel.swift
index 0e2005b024b94a28d4476624e507b10cc9d88f72..ee2b4ad7e52646d4b415bcd6123dd78cdebece26 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BatchNormKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BatchNormKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class BatchNormKernel<P: PrecisionType>: Kernel, Computable {
+class BatchNormKernel<P: PrecisionProtocol>: Kernel, Computable {
     required init(device: MTLDevice, param: BatchNormParam<P>, initContext: InitContext) {
         let count = param.variance.dim.numel()
         let varianceP = param.variance.data.pointer
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BilinearInterpKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BilinearInterpKernel.swift
index c8a65190851c7af154dc6c1f61cbde05db243632..8a217eacb11cdc3732540d576f62b91835221450 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BilinearInterpKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BilinearInterpKernel.swift
@@ -19,7 +19,7 @@ struct BilinearInterpMetalParam {
     var ratio_w: Float32
 }
 
-class BilinearInterpKernel<P: PrecisionType>: Kernel, Computable{
+class BilinearInterpKernel<P: PrecisionProtocol>: Kernel, Computable{
     func compute(commandBuffer: MTLCommandBuffer, param: BilinearInterpParam<P>) throws {
         guard let encoder = commandBuffer.makeComputeCommandEncoder() else {
             throw PaddleMobileError.predictError(message: " encode is nil")
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BoxcoderKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BoxcoderKernel.swift
index 8f295672c19991897d85ffb6622dfb840d0c0b50..94ece69eebdcab2faca3d287a770a16439843d4f 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BoxcoderKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/BoxcoderKernel.swift
@@ -17,7 +17,7 @@ import Foundation
 struct BoxcoderMetalParam {
 }
 
-class BoxcoderKernel<P: PrecisionType>: Kernel, Computable{
+class BoxcoderKernel<P: PrecisionProtocol>: Kernel, Computable{
     func compute(commandBuffer: MTLCommandBuffer, param: BoxcoderParam<P>) throws {
         guard let encoder = commandBuffer.makeComputeCommandEncoder() else {
             throw PaddleMobileError.predictError(message: " encode is nil")
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConcatKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConcatKernel.swift
index 195366c79668f7553848f969be03fbddb36d7905..803b2f593ccd3c8afffe4d6219be5314f950f254 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConcatKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConcatKernel.swift
@@ -31,7 +31,7 @@ struct ConcatMetalParam {
     var vdim: (Int32, Int32, Int32, Int32, Int32, Int32) = (0, 0, 0, 0, 0, 0)
 }
 
-class ConcatKernel<P: PrecisionType>: Kernel, Computable{
+class ConcatKernel<P: PrecisionProtocol>: Kernel, Computable{
     var v = "normal"
     var pm = ConcatMetalParam.init()
     func compute(commandBuffer: MTLCommandBuffer, param: ConcatParam<P>) throws {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddAddPreluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddAddPreluKernel.swift
index b2dd3064469ef465f785c8e7d5153abce9d687a3..c89900a84e4df1c2b4873c96f2260a62e20b7d4a 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddAddPreluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddAddPreluKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvAddAddPreluKernel<P: PrecisionType>: Kernel, Computable {
+class ConvAddAddPreluKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: MetalConvParam!
     required init(device: MTLDevice, param: ConvAddAddPreluParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: [0, 2, 3, 1], computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddBatchNormReluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddBatchNormReluKernel.swift
index 0ff0b57f6c8497cf916804b152fbd57a301c6a5c..ca6cae65c8fcac12ed29cd46775edeb2f43a3f8c 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddBatchNormReluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddBatchNormReluKernel.swift
@@ -36,7 +36,7 @@ struct ConvAddBatchNormReluTestParam: TestParam {
     }
 }
 
-class ConvAddBatchNormReluKernel<P: PrecisionType>: Kernel, Computable, Testable {
+class ConvAddBatchNormReluKernel<P: PrecisionProtocol>: Kernel, Computable, Testable {
     required init(device: MTLDevice, testParam: ConvAddBatchNormReluTestParam, initContext: InitContext) {
         if testParam.filterSize.width == 1 && testParam.filterSize.height == 1 {
             super.init(device: device, inFunctionName: "conv_add_batch_norm_relu_1x1", initContext: initContext)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddKernel.swift
index b770ae0d74c88440fc14d6643e86e31e4f9984a7..65f01645d0c997323c1bd53498b68fddea1d98d6 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddKernel.swift
@@ -27,7 +27,7 @@ func getUniqueKey() -> String {
     return UUID.init().uuidString
 }
 
-class ConvAddKernel<P: PrecisionType>: Kernel, Computable {
+class ConvAddKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: MetalConvParam!
     
     let identifyingKey: String = getUniqueKey()
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddPreluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddPreluKernel.swift
index 1b054cb9cab80c0cb053e2cdbf8d0af6779ee477..3535ae1868ecde2ac2794b542dbefdd72b198e2c 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddPreluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddPreluKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ConvAddPreluKernel<P: PrecisionType>: Kernel, Computable {
+class ConvAddPreluKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: MetalConvParam!
     required init(device: MTLDevice, param: ConvAddPreluParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: [0, 2, 3, 1], computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvBNReluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvBNReluKernel.swift
index 415ec94b517405ad15f331bd3fcebf8414fbf754..9fa519a7eb80928919048e4d67c09456a87ab86f 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvBNReluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvBNReluKernel.swift
@@ -37,7 +37,7 @@ struct ConvBNReluTestParam: TestParam {
     }
 }
 
-class ConvBNReluKernel<P: PrecisionType>: Kernel, Computable, Testable {
+class ConvBNReluKernel<P: PrecisionProtocol>: Kernel, Computable, Testable {
     required init(device: MTLDevice, testParam: ConvBNReluTestParam, initContext: InitContext) {
         if testParam.filterSize.width == 1 && testParam.filterSize.height == 1 {
             super.init(device: device, inFunctionName: "conv_batch_norm_relu_1x1", initContext: initContext)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvKernel.swift
index 7ff040219e9d5277f6becbbaf353386008863c97..fff6dd4726b16fd258df8ba1469d4889900a9970 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvKernel.swift
@@ -24,10 +24,10 @@ public struct MetalConvParam {
     let dilationY: UInt16
 }
 
-class ConvKernel<P: PrecisionType>: Kernel, Computable {
+class ConvKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: MetalConvParam!
     required init(device: MTLDevice, param: ConvParam<P>, initContext: InitContext) {
-        param.filter.initBuffer(device: device, precision: ComputePrecision.Float32)
+        param.filter.initBuffer(device: device, precision: Precision.Float32)
         if param.filter.width == 1 && param.filter.height == 1 {
             super.init(device: device, inFunctionName: "conv_1x1", initContext: initContext)
         } else if param.filter.channel == 1 {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvTransposeKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvTransposeKernel.swift
index f1753d0a09294e82eae5c01c23d4fe1c7b220c8d..33ee422c3add3ca00f9d88736427873d41b6d702 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvTransposeKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvTransposeKernel.swift
@@ -28,7 +28,7 @@ struct MetalConvTransposeParam {
     let dilationY: UInt16;
 }
 
-class ConvTransposeKernel<P: PrecisionType>: Kernel, Computable{
+class ConvTransposeKernel<P: PrecisionProtocol>: Kernel, Computable{
     var metalParam: MetalConvTransposeParam!
     required init(device: MTLDevice, param: ConvTransposeParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: param.input.transpose, computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddKernel.swift
index 2a87d4362f51a237f5d8620116cdc6c17c7d059c..8d4bed8674db48f3b73d86b25a6ea787b216c02a 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddKernel.swift
@@ -24,7 +24,7 @@ struct ElementwiseAddMetalParam {
     var ytrans: (Int32, Int32, Int32, Int32) = (0, 1, 2, 3)
 }
 
-class ElementwiseAddKernel<P: PrecisionType>: Kernel, Computable {
+class ElementwiseAddKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: ElementwiseAddMetalParam
     required init(device: MTLDevice, param: ElementwiseAddParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: param.inputX.transpose, computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddPreluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddPreluKernel.swift
index cf83c2e750aaf8c3c9dfd27c096970b84be217d7..34c45cb06171ee37b292597240ca748e57d78137 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddPreluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ElementwiseAddPreluKernel.swift
@@ -15,7 +15,7 @@
 import Foundation
 
 
-class ElementwiseAddPreluKernel<P: PrecisionType>: Kernel, Computable {
+class ElementwiseAddPreluKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: ElementwiseAddMetalParam
     required init(device: MTLDevice, param: ElementwiseAddPreluParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: param.inputX.transpose, computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FetchKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FetchKernel.swift
index 616fcc1f2d61c4ffba9baa2c7183a5b172fb7b2e..8164a98efab614e4241576f27071021c51d282e4 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FetchKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FetchKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class FetchKernel<P: PrecisionType>: Kernel, Computable {
+class FetchKernel<P: PrecisionProtocol>: Kernel, Computable {
     
     required init(device: MTLDevice, param: FetchParam<P>, initContext: InitContext) {
         param.output.initBuffer(device: device)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FlattenKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FlattenKernel.swift
index 5956806001e8ec3cfb33c6d13095f0e11aa9420d..7e9f129a015c1859c0fb848815eb2c8f5d4eebc0 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FlattenKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/FlattenKernel.swift
@@ -22,7 +22,7 @@ struct FlattenMetalParam {
 }
 
 
-class FlattenKernel<P: PrecisionType>: Kernel, Computable{
+class FlattenKernel<P: PrecisionProtocol>: Kernel, Computable{
     
     var metalParam: FlattenMetalParam
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/MulticlassNMSKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/MulticlassNMSKernel.swift
index 4f59bf9971704b26ba360cefac3fc50558db3d0e..d3350a4225ecaf273a716a99334a2b46317d61e5 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/MulticlassNMSKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/MulticlassNMSKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class MulticlassNMSKernel<P: PrecisionType>: Kernel, Computable{
+class MulticlassNMSKernel<P: PrecisionProtocol>: Kernel, Computable{
     let pipline1: MTLComputePipelineState
     
     required init(device: MTLDevice, param: MulticlassNMSParam<P>, initContext: InitContext) {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PoolKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PoolKernel.swift
index 37878f26d08ed79e8bfa7c8a1e2e800c8775ff53..2e7a4c38566ff3bd9da1ea79345cf015cbd17cbe 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PoolKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PoolKernel.swift
@@ -24,7 +24,7 @@ struct PoolMetalParam {
     let poolType: Int32
 }
 
-class PoolKernel<P: PrecisionType>: Kernel, Computable{
+class PoolKernel<P: PrecisionProtocol>: Kernel, Computable{
     var metalParam: PoolMetalParam
     required init(device: MTLDevice, param: PoolParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: param.input.transpose, computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PreluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PreluKernel.swift
index 053cb827e3c9d37253b487bddea43ee520aca308..906dc0fcfe650a57e6e9d66d6f17c0bf44e15294 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PreluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PreluKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class PreluKernel<P: PrecisionType>: Kernel, Computable{
+class PreluKernel<P: PrecisionProtocol>: Kernel, Computable{
     required init(device: MTLDevice, param: PreluParam<P>, initContext: InitContext) {
         param.alpha.initBuffer(device: device, precision: GlobalConfig.shared.computePrecision)
         param.output.initTexture(device: device, inTranspose: param.input.transpose, computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PriorBoxKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PriorBoxKernel.swift
index cb8ef81de3176ac7fcf3e3f43a6c023a2e09eb18..009062c889a303da31835ffcfa57811ebcd3cb85 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PriorBoxKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/PriorBoxKernel.swift
@@ -29,7 +29,7 @@ struct PriorBoxMetalParam {
     let maxSizeSize: uint
 }
 
-class PriorBoxKernel<P: PrecisionType>: Kernel, Computable{
+class PriorBoxKernel<P: PrecisionProtocol>: Kernel, Computable{
     var metalParam: PriorBoxMetalParam!
     
     required init(device: MTLDevice, param: PriorBoxParam<P>, initContext: InitContext) {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReluKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReluKernel.swift
index 06ff7d39902602dbb6bf3639192a12a582ef9550..e4fe6fdf8c056689b7e529f6fa1ccce5a75d146d 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReluKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReluKernel.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ReluKernel<P: PrecisionType>: Kernel, Computable{
+class ReluKernel<P: PrecisionProtocol>: Kernel, Computable{
     func compute(commandBuffer: MTLCommandBuffer, param: ReluParam<P>) throws {
         guard let encoder = commandBuffer.makeComputeCommandEncoder() else {
             throw PaddleMobileError.predictError(message: " encode is nil")
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReshapeKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReshapeKernel.swift
index 954eff9a568ec7e7a816aa508d3f0415c5857503..0613e4952dacba2b336d017b9010cfa855f41dfb 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReshapeKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ReshapeKernel.swift
@@ -27,7 +27,7 @@ struct ReshapeTestParam: TestParam {
     let param: ReshapeMetalParam
 }
 
-class ReshapeKernel<P: PrecisionType>: Kernel, Computable{
+class ReshapeKernel<P: PrecisionProtocol>: Kernel, Computable{
     
     var metalParam: ReshapeMetalParam
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ResizeBilinearKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ResizeBilinearKernel.swift
index 7e9105ae57ed59ceab3ace5c64cdfd97ba029a1f..5edf80332abf81772192218c96e524ab4a05d91a 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ResizeBilinearKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ResizeBilinearKernel.swift
@@ -19,7 +19,7 @@ struct ResizeBilinearMetalParam {
     var ratio_w: Float32
 }
 
-class ResizeBilinearKernel<P: PrecisionType>: Kernel, Computable{
+class ResizeBilinearKernel<P: PrecisionProtocol>: Kernel, Computable{
     required init(device: MTLDevice, param: ResizeBilinearParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, inTranspose: param.input.transpose, computePrecision: GlobalConfig.shared.computePrecision)
         if GlobalConfig.shared.computePrecision == .Float32 {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ShapeKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ShapeKernel.swift
index 1d2b80cae412ce34415f6c678f0912bbf29e1bb2..a4f250a175c85c99437e2ad00d511c90507ba2d6 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ShapeKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ShapeKernel.swift
@@ -18,7 +18,7 @@ import Foundation
 struct ShapeMetalParam {
 }
 
-class ShapeKernel<P: PrecisionType>: Kernel, Computable{
+class ShapeKernel<P: PrecisionProtocol>: Kernel, Computable{
     func compute(commandBuffer: MTLCommandBuffer, param: ShapeParam<P>) throws {
         //    print("shape compute")
         //    guard let encoder = commandBuffer.makeComputeCommandEncoder() else {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SoftmaxKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SoftmaxKernel.swift
index b4f3281425474eba90cbb3ac6e262cf06f3eeb2d..bccb37c47d820fe010bb4780885875bb886ae24d 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SoftmaxKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SoftmaxKernel.swift
@@ -19,7 +19,7 @@ struct SoftmaxMetalParam {
     let K: Int32
 }
 
-class SoftmaxKernel<P: PrecisionType>: Kernel, Computable{
+class SoftmaxKernel<P: PrecisionProtocol>: Kernel, Computable{
     
     var metalParam: SoftmaxMetalParam
     required init(device: MTLDevice, param: SoftmaxParam<P>, initContext: InitContext) {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SplitKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SplitKernel.swift
index d15e37296290980a3a7092b7e52a82d33e1044a9..eaaffa7bfe8a07df4a1da2ebd5ca10b8d373f1e3 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SplitKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/SplitKernel.swift
@@ -22,7 +22,7 @@ struct SplitMetalParam {
     var vdim: (Int32, Int32, Int32, Int32) = (0, 0, 0, 0)
 }
 
-class SplitKernel<P: PrecisionType>: Kernel, Computable{
+class SplitKernel<P: PrecisionProtocol>: Kernel, Computable{
     var smp: SplitMetalParam
     func compute(commandBuffer: MTLCommandBuffer, param: SplitParam<P>) throws {
         guard let encoder = commandBuffer.makeComputeCommandEncoder() else {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Texture2DTo2DArrayKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Texture2DTo2DArrayKernel.swift
index 58b3db8d8666fd4321eb5554541dca66cf5b6397..022d31df8f569a1a055c580f3ae02b48ed43ff24 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Texture2DTo2DArrayKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/Texture2DTo2DArrayKernel.swift
@@ -22,7 +22,7 @@ struct Texture2DTo2DArrayParam {
     let expectDim: Dim
 }
 
-class Texture2DTo2DArrayKernel<P: PrecisionType>: Kernel, Computable{
+class Texture2DTo2DArrayKernel<P: PrecisionProtocol>: Kernel, Computable{
     func compute(commandBuffer: MTLCommandBuffer, param: FeedParam<P>) throws {
         guard let encoder = commandBuffer.makeComputeCommandEncoder() else {
             throw PaddleMobileError.predictError(message: " encode is nil")
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/TransposeKernel.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/TransposeKernel.swift
index 92947dc27845986c43d099f58c147c1f4c86a4ef..a2f87758348ed0b692937e9f7222f19c3550ac97 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/TransposeKernel.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/TransposeKernel.swift
@@ -20,7 +20,7 @@ struct TransposeMetalParam {
     var axis: (Int32, Int32, Int32, Int32) = (0, 1, 2, 3)
 }
 
-class TransposeKernel<P: PrecisionType>: Kernel, Computable {
+class TransposeKernel<P: PrecisionProtocol>: Kernel, Computable {
     var metalParam: TransposeMetalParam = TransposeMetalParam.init()
     required init(device: MTLDevice, param: TransposeParam<P>, initContext: InitContext) {
         param.output.initTexture(device: device, computePrecision: GlobalConfig.shared.computePrecision)
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/MulticlassNMSOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/MulticlassNMSOp.swift
index b438b3c46cf061d48837646d1678c150223c4673..c8dcf4e023fdebd7a817bb3b56343f3af8483fdd 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/MulticlassNMSOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/MulticlassNMSOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class MulticlassNMSParam<P: PrecisionType>: OpParam {
+class MulticlassNMSParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -36,7 +36,7 @@ class MulticlassNMSParam<P: PrecisionType>: OpParam {
     var output: Texture
 }
 
-class MulticlassNMSOp<P: PrecisionType>: Operator<MulticlassNMSKernel<P>, MulticlassNMSParam<P>>, Runable, Creator, InferShaperable{
+class MulticlassNMSOp<P: PrecisionProtocol>: Operator<MulticlassNMSKernel<P>, MulticlassNMSParam<P>>, Runable, Creator, InferShaperable{
     
     func inputVariant() -> [String : [MTLBuffer]] {
         guard let scoreBuffer = para.middleOutput.resultBuffer, let bboxBuffer = para.middleOutput.resultBuffer else {
@@ -48,8 +48,8 @@ class MulticlassNMSOp<P: PrecisionType>: Operator<MulticlassNMSKernel<P>, Multic
     func computeMiddleResult(device: MTLDevice, buffer: MTLCommandBuffer) {
         do {
             try kernel.compute(commandBuffer: buffer, param: para)
-        } catch let _ {
-            fatalError()
+        } catch let error {
+            fatalError("\(error)")
         }
     }
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/PoolOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/PoolOp.swift
index 8b212f3b1d0ea616881eef3f35dc4bc1eb2f02f2..8fed29aeddf126ebbe7986a9db4fba0a0d405738 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/PoolOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/PoolOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class PoolParam<P: PrecisionType>: OpParam {
+class PoolParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -42,7 +42,7 @@ class PoolParam<P: PrecisionType>: OpParam {
     var globalPooling: Bool
 }
 
-class PoolOp<P: PrecisionType>: Operator<PoolKernel<P>, PoolParam<P>>, Runable, Creator, InferShaperable{
+class PoolOp<P: PrecisionProtocol>: Operator<PoolKernel<P>, PoolParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = PoolOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/PreluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/PreluOp.swift
index 09a6b027e38b640e355357f244f0e6150e0d95d5..429e82a49350b42791296330b418c2126b0605e8 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/PreluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/PreluOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class PreluParam<P: PrecisionType>: OpParam {
+class PreluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -32,7 +32,7 @@ class PreluParam<P: PrecisionType>: OpParam {
     var output: Texture
 }
 
-class PreluOp<P: PrecisionType>: Operator<PreluKernel<P>, PreluParam<P>>, Runable, Creator, InferShaperable{
+class PreluOp<P: PrecisionProtocol>: Operator<PreluKernel<P>, PreluParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = PreluOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/PriorBoxOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/PriorBoxOp.swift
index 80774f22a9fa27fa97165636b3792785d3146add..6af9490766ba9d2e50ac715ac6a510e207329116 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/PriorBoxOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/PriorBoxOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class PriorBoxParam<P: PrecisionType>: OpParam {
+class PriorBoxParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -59,7 +59,7 @@ class PriorBoxParam<P: PrecisionType>: OpParam {
     let outputVariances: Texture
 }
 
-class PriorBoxOp<P: PrecisionType>: Operator<PriorBoxKernel<P>, PriorBoxParam<P>>, Runable, Creator, InferShaperable{
+class PriorBoxOp<P: PrecisionProtocol>: Operator<PriorBoxKernel<P>, PriorBoxParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = PriorBoxOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ReluOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ReluOp.swift
index a286114b3ff02365ce5ce51a841d85955996110b..8a782f694b58cfe99146a8f7df2f1b8c0b5079be 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ReluOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ReluOp.swift
@@ -15,7 +15,7 @@
 
 import Foundation
 
-class ReluParam<P: PrecisionType>: OpParam {
+class ReluParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -29,7 +29,7 @@ class ReluParam<P: PrecisionType>: OpParam {
     var output: Texture
 }
 
-class ReluOp<P: PrecisionType>: Operator<ReluKernel<P>, ReluParam<P>>, Runable, Creator, InferShaperable{
+class ReluOp<P: PrecisionProtocol>: Operator<ReluKernel<P>, ReluParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = ReluOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ReshapeOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ReshapeOp.swift
index 417344f1da60f160b7727872355652821e4cdb61..acff1c95eaf421acd46293048c43d18456c45439 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ReshapeOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ReshapeOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class ReshapeParam<P: PrecisionType>: OpParam {
+class ReshapeParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -53,7 +53,7 @@ class ReshapeParam<P: PrecisionType>: OpParam {
     var output: Texture
 }
 
-class ReshapeOp<P: PrecisionType>: Operator<ReshapeKernel<P>, ReshapeParam<P>>, Runable, Creator, InferShaperable{
+class ReshapeOp<P: PrecisionProtocol>: Operator<ReshapeKernel<P>, ReshapeParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = ReshapeOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ResizeBilinearOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ResizeBilinearOp.swift
index e71a62b682bd40bdb3f910aafb2d11f2fe439df0..7b9fbf412ff2216195f764f32cd757516604052d 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ResizeBilinearOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ResizeBilinearOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ResizeBilinearParam<P: PrecisionType>: OpParam {
+class ResizeBilinearParam<P: PrecisionProtocol>: OpParam {
     typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -35,7 +35,7 @@ class ResizeBilinearParam<P: PrecisionType>: OpParam {
     let out_w: Int32
 }
 
-class ResizeBilinearOp<P: PrecisionType>: Operator<ResizeBilinearKernel<P>, ResizeBilinearParam<P>>, Runable, Creator, InferShaperable{
+class ResizeBilinearOp<P: PrecisionProtocol>: Operator<ResizeBilinearKernel<P>, ResizeBilinearParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = ResizeBilinearOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/ShapeOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/ShapeOp.swift
index fd358a67aee6e9403d7d8cb5ca3d1c11e5e1f5cb..c3a1d37f52286ee21355e308705b07a119c5a1b0 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/ShapeOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/ShapeOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class ShapeParam<P: PrecisionType>: OpParam {
+class ShapeParam<P: PrecisionProtocol>: OpParam {
     // typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -28,7 +28,7 @@ class ShapeParam<P: PrecisionType>: OpParam {
     let input: Texture
 }
 
-class ShapeOp<P: PrecisionType>: Operator<ShapeKernel<P>, ShapeParam<P>>, Runable, Creator, InferShaperable{
+class ShapeOp<P: PrecisionProtocol>: Operator<ShapeKernel<P>, ShapeParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = ShapeOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/SoftmaxOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/SoftmaxOp.swift
index f13bf201956f04ee0a41124bf8556c1d6f31e410..cf56f9590c2ddbfa5b5d190bb71a094239d06311 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/SoftmaxOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/SoftmaxOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class SoftmaxParam<P: PrecisionType>: OpParam {
+class SoftmaxParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -36,7 +36,7 @@ class SoftmaxParam<P: PrecisionType>: OpParam {
     var output: Texture
 }
 
-class SoftmaxOp<P: PrecisionType>: Operator<SoftmaxKernel<P>, SoftmaxParam<P>>, Runable, Creator, InferShaperable{
+class SoftmaxOp<P: PrecisionProtocol>: Operator<SoftmaxKernel<P>, SoftmaxParam<P>>, Runable, Creator, InferShaperable{
     typealias OpType = SoftmaxOp<P>
     
     func inferShape() {
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/SplitOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/SplitOp.swift
index 4d5cb9b0beff3a657c5a72fe00ef6f9e9140cc58..d6f4aa4784dd7886b7ee9698abf7dca8b66137c0 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/SplitOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/SplitOp.swift
@@ -14,7 +14,7 @@
 
 import Foundation
 
-class SplitParam<P: PrecisionType>: OpParam {
+class SplitParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -47,7 +47,7 @@ class SplitParam<P: PrecisionType>: OpParam {
     var sections: [Int32] = []
 }
 
-class SplitOp<P: PrecisionType>: Operator<SplitKernel<P>, SplitParam<P>>, Runable, Creator, InferShaperable{
+class SplitOp<P: PrecisionProtocol>: Operator<SplitKernel<P>, SplitParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = SplitOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Operators/TransposeOp.swift b/metal/paddle-mobile/paddle-mobile/Src/Operators/TransposeOp.swift
index c05c08066797d8d5c7855d8294ad7f703e85e582..458bbef54fb3136e8b9144e387e8c359873f93d7 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Operators/TransposeOp.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Operators/TransposeOp.swift
@@ -15,7 +15,7 @@
 import Foundation
 import Metal
 
-class TransposeParam<P: PrecisionType>: OpParam {
+class TransposeParam<P: PrecisionProtocol>: OpParam {
     //typealias ParamPrecisionType = P
     required init(opDesc: PMOpDesc, inScope: Scope) throws {
         do {
@@ -31,7 +31,7 @@ class TransposeParam<P: PrecisionType>: OpParam {
     let axis: [Int32]
 }
 
-class TransposeOp<P: PrecisionType>: Operator<TransposeKernel<P>, TransposeParam<P>>, Runable, Creator, InferShaperable{
+class TransposeOp<P: PrecisionProtocol>: Operator<TransposeKernel<P>, TransposeParam<P>>, Runable, Creator, InferShaperable{
     
     typealias OpType = TransposeOp<P>
     
diff --git a/metal/paddle-mobile/paddle-mobile/Src/Program/ProgramOptimize.swift b/metal/paddle-mobile/paddle-mobile/Src/Program/ProgramOptimize.swift
index e4248b64098bd7939f09577566021c1756c05085..aaf1da12382072efacfbb2dd91755b8d4f36f639 100644
--- a/metal/paddle-mobile/paddle-mobile/Src/Program/ProgramOptimize.swift
+++ b/metal/paddle-mobile/paddle-mobile/Src/Program/ProgramOptimize.swift
@@ -181,7 +181,7 @@ extension Node: Equatable {
     
 }
 
-class ProgramOptimize<P: PrecisionType> {
+class ProgramOptimize<P: PrecisionProtocol> {
     // register fusion
     let fusionOps: [Fusion.Type] = [ConvAddBatchNormReluOp<P>.self,
                                     //                                  ConvAddAddPreluOp<P>.self,