From d93cf1b9966f350be8792a338bfa0def3875df44 Mon Sep 17 00:00:00 2001
From: sugarme <thangtran@hotmail.com>
Date: Tue, 27 Oct 2020 17:30:58 +1100
Subject: [PATCH] reverse changed #10

---
 tensor/tensor.go | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/tensor/tensor.go b/tensor/tensor.go
index af38988..1b8d08b 100644
--- a/tensor/tensor.go
+++ b/tensor/tensor.go
@@ -873,25 +873,11 @@ func (ts Tensor) MustToString(lw int64) (retVal string) {
 
 // Drop drops (frees) the tensor
 func (ts Tensor) Drop() (err error) {
-
-	// has not freed yet.
-	if !ts.MustDefined() {
-		return nil
-	}
-
 	lib.AtFree(ts.ctensor)
 	if err = TorchErr(); err != nil {
 		return err
 	}
 
-	// NOTE. there is no reliable way to tell if a pointer has been freed.
-	// Ref. https://stackoverflow.com/questions/8300853
-	// This is a hacky way: as soon as tensor is free up, turn it into "undefined" tensor.
-	// So that next time, call `ts.MustDefined()` to check whether tensor has been freed.
-	// This is useful as when can call `ts.MustDrop()` multiple times without worrying
-	// about "free(): double free detected..." error.
-	ts = NewTensor() // ts now is "undefined"
-
 	return nil
 }
 
@@ -1168,10 +1154,3 @@ func (ts Tensor) Swish() (retVal Tensor) {
 func (ts Tensor) AvgPool2DDefault(ksize int64, del bool) (retVal Tensor) {
 	return ts.MustAvgPool2d([]int64{ksize, ksize}, []int64{ksize, ksize}, []int64{0, 0}, false, true, 1, del)
 }
-
-func (ts Tensor) IsNil() bool {
-
-	C.free(unsafe.Pointer(ts.ctensor))
-
-	return unsafe.Pointer(ts.ctensor) == nil
-}