temp fixed huge lr groups returned from C

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Fixed temporary fix huge number of learning group returned from C at `libtch/tensor.go AtoGetLearningRates`
+
 ## [Nofix]
 - ctype `long` caused compiling error in MacOS as noted on [#44]. Not working on linux box.
 

libtch/tensor.go

@@ -464,6 +464,12 @@ func AtoGetLearningRates(coptimizer Coptimizer) []float64 {
 	C.ato_get_learning_rates(coptimizer, cLRsPtr, cngroup)
 	ngroup := *(*int)(unsafe.Pointer(cngroup))
 
+	// NOTE. temp fix `panic: runtime error: makeslice: len out of range`
+	// due to error in C side with ngroup ridiculous huge number (ie. ngroup: 139745350909953)
+	if ngroup > 1000 {
+		ngroup = 1
+	}
+
 	var lrs []float64 = make([]float64, ngroup)
 	var currPtr *C.double = cLRsPtr
 	for i := 0; i < ngroup; i++ {