enable all mps conv layer (#1592)

metal/paddle-mobile/paddle-mobile/Src/Framework/Texture.swift

@@ -135,9 +135,17 @@ public class Texture: Tensorial {
         }
         
         if computePrecision == .Float16 {
-            tmpTextureDes.pixelFormat = .rgba16Float
+            if tensorDim[1] == 1 {
+                tmpTextureDes.pixelFormat = .r16Float
+            } else {
+                tmpTextureDes.pixelFormat = .rgba16Float
+            }
         } else if computePrecision == .Float32 {
-            tmpTextureDes.pixelFormat = .rgba32Float
+            if tensorDim[1] == 1 {
+                tmpTextureDes.pixelFormat = .r32Float
+            } else {
+                tmpTextureDes.pixelFormat = .rgba32Float
+            }
         }
         
         tmpTextureDes.usage = [.shaderRead, .shaderWrite]

metal/paddle-mobile/paddle-mobile/Src/Operators/Kernels/ConvAddKernel.swift

@@ -111,10 +111,7 @@ class ConvAddKernel<P: PrecisionProtocol>: Kernel, Computable {
         
         var shouldUseMPS = false
         if #available(iOS 11.0, *), initContext.useMPS {
-            // 输入输出 tensor channel 必须都大于 4
-            if param.input.tensorDim[1] > 4 && param.output.tensorDim[1] > 4 {
-                shouldUseMPS = true
-            }
+            shouldUseMPS = true
         }
         
         if shouldUseMPS {