diff --git a/src/core/helpers/SoftmaxHelpers.h b/src/core/helpers/SoftmaxHelpers.h
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+/*
+* Copyright (c) 2020 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef SRC_CORE_HELPERS_SOFTMAXHELPERS_H
+#define SRC_CORE_HELPERS_SOFTMAXHELPERS_H
+
+#include "arm_compute/core/Types.h"
+
+namespace arm_compute
+{
+namespace softmax_helpers
+{
+/** Given a softmax axis, this function returns the permutation vector required to put the axis to the front
+ *
+ * @note This function assumes a tensor rank <= 4
+ *
+ * Axis selects the dimension on which softmax is performed.
+ * E.g. For input of shape 4x5x6 and axis=1, softmax will be applied to 4x6=24 vectors of size 5.
+ * Interally softmax kernels is always performed on the first dimension (front dimension), therefore permutation is
+ * required to put the dimension specified by @p axis to the first dimension.
+ *
+ * @param[in] axis Axis on which to perform softmax. Supported: 1, 2, 3 (0 implies no permutation needed)
+ *
+ * @return the permutation vector
+ */
+PermutationVector get_permutation_vector_from_softmax_axis(size_t axis);
+} // namespace softmax_helpers
+} // namespace arm_compute
+
+#endif /* SRC_CORE_HELPERS_SOFTMAXHELPERS_H */