[src] More work on tensor library draft in kaldi10 (#3124)

Author: danpovey

src/tensor/tensor-functions.h

@@ -0,0 +1,32 @@
+#include "tensor/tensor.h"
+
+
+namespace kaldi {
+namespace tensor {
+
+// This file contains functions that operate on Tensors in various ways.  To
+// avoid class Tensor blowing up hugely, we implement these things outside
+// class Tensor.
+
+
+// Note: we use the distinction between references and pointers the same way as
+// you might expect from Google-style-guide code, to reflect which Tensors'
+// contents are changed (so a pointer argument might have its contents changed.
+// But these are in most cases pointers to const Tensors; they can be
+// donst because the metadata is not changed, even if the data is.
+
+
+// Sets all elements of the tensor to zero.
+void SetZero(const Tensor *tensor);
+
+// Sets all elements of the tensor to value f (cast to whatever type
+// this Tensor has).
+void SetZero(float f, const Tensor *tensor);
+
+
+// Return a transposed version of this Tensor that shares the underlying memory.
+Tensor Transpose(const Tensor &tensor, int64_t axis1 = 0, int64_t axis2 = 1);
+
+
+}
+}