fix #172 (#173)

- steel_attenion.metal (new) was missing from the build

Source/Cmlx/mlx-generated/metal/steel/attn/kernels/steel_attention.metal

@@ -0,0 +1,31 @@
+// Copyright © 2024 Apple Inc.
+
+// clang-format off
+#include "../../../utils.h"
+
+#include "../../../steel/attn/attn.h"
+#include "../../../steel/attn/kernels/steel_attention.h"
+
+#define instantiate_attn(tname, dtype, bq, bk, bd, wm, wn) \
+  template [[host_name("steel_attention_" #tname "_bq" #bq "_bk" #bk "_bd" #bd "_wm" #wm "_wn" #wn)]] \
+  [[kernel]] void attention<dtype, bq, bk, bd, wm, wn, float>( \
+      const device dtype* Q [[buffer(0)]], \
+      const device dtype* K [[buffer(1)]], \
+      const device dtype* V [[buffer(2)]], \
+      device dtype* O [[buffer(3)]],\
+      const constant AttnParams* params [[buffer(4)]], \
+      uint simd_lane_id [[thread_index_in_simdgroup]], \
+      uint simd_group_id [[simdgroup_index_in_threadgroup]], \
+      uint3 tid [[threadgroup_position_in_grid]], \
+      uint3 lid [[thread_position_in_threadgroup]]);
+
+#define instantiate_attn_shapes_helper(iname, itype) \
+    instantiate_attn(iname, itype, 32, 16, 128, 4, 1) \
+    instantiate_attn(iname, itype, 32, 32,  80, 4, 1) \
+    instantiate_attn(iname, itype, 32, 32,  64, 4, 1)
+
+instantiate_attn_shapes_helper(float16, half);
+instantiate_attn_shapes_helper(bfloat16, bfloat16_t);
+
+instantiate_attn_shapes_helper(float32, float);
+// clang-format on

Tests/MLXTests/MLXFastKernelTests.swift

@@ -70,4 +70,30 @@ class MLXFastKernelTests: XCTestCase {
         XCTAssertTrue(allClose(out[0], full([2, 2], values: 14.0484)).all().item())
         XCTAssertTrue(allClose(out[1], full([3, 2], values: -2)).all().item())
     }
+
+    func testFastSDPA() {
+        // https://github.com/ml-explore/mlx-swift/issues/172
+        // this will just make sure the MLXFast.scaled_dot_product_attention is
+        // callable in the various cases, based on
+        // https://github.com/ml-explore/mlx/blob/main/python/tests/test_fast_sdpa.py#L65-L87
+
+        let Dk = 64
+        let scale = 1.0 / sqrt(Float(Dk))
+        let dTypes = [DType.float32, DType.float16]
+        for SEQUENCE_LENGTH in [63, 129, 400] {
+            for dtype in dTypes {
+                let B = 2
+                let H = 24
+                let q = MLXRandom.normal([B, H, SEQUENCE_LENGTH, Dk]).asType(dtype)
+                let k = MLXRandom.normal([B, H, SEQUENCE_LENGTH, Dk]).asType(dtype)
+                let v = MLXRandom.normal([B, H, SEQUENCE_LENGTH, Dk]).asType(dtype)
+
+                let result = MLXFast.scaledDotProductAttention(
+                    queries: q, keys: k, values: v, scale: scale, mask: nil,
+                    memoryEfficientThreshold: 2)
+
+                eval(result)
+            }
+        }
+    }
 }

tools/fix-metal-includes.sh

@@ -23,11 +23,12 @@ KERNEL_LIST=" \
 arg_reduce.metal \
 conv.metal \
 gemv.metal \
+layer_norm.metal \
 random.metal \
 rms_norm.metal \
-layer_norm.metal \
 rope.metal \
-scaled_dot_product_attention.metal"
+scaled_dot_product_attention.metal \
+steel/attn/kernels/steel_attention.metal"
 
 # We fixup all the header files AND the listed kernel files
 HEADERS=$(find "${KERNELS_DIR}" -name "*.h")