From 0cf13e2b8445219a609d75b6aac2811a8cdcc801 Mon Sep 17 00:00:00 2001
From: imperatormk <darko.simonovski@hotmail.com>
Date: Tue, 3 Mar 2026 17:16:22 +0100
Subject: [PATCH] define g_fp16_io in train.m (fixes linker error)

---
 training/train.m | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/training/train.m b/training/train.m
index 6fd4a86..6a70041 100644
--- a/training/train.m
+++ b/training/train.m
@@ -8,6 +8,8 @@
 #include <math.h>
 #include "backward.h"
 
+int g_fp16_io = 0;  // M1/M2: use fp16 I/O when cast op unsupported
+
 static mach_timebase_info_data_t g_tb;
 static double ticksToMs(uint64_t t) { return (double)t * g_tb.numer / g_tb.denom / 1e6; }