Add custom multi_tensor_apply kernels (L2norm, Adam)

transformer_engine/common/include/transformer_engine/multi_tensor.h

@@ -1,4 +1,6 @@
 /*************************************************************************
+ * This file was modified for portability to AMDGPU
+ * Copyright (c) 2026, Advanced Micro Devices, Inc. All rights reserved.
  * Copyright (c) 2022-2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
  *
  * See LICENSE for license information.
@@ -68,6 +70,28 @@ void nvte_multi_tensor_unscale_l2norm_cuda(int chunk_size, NVTETensor noop_flag,
                                            int per_tensor, int max_chunks_per_tensor,
                                            cudaStream_t stream);
 
+/*!  \brief Computes cumulative L2 norm for a list of tensors from precomputed chunk metadata.
+ *
+ * \warning   This API is **experimental** and subject to change.
+ */
+void nvte_multi_tensor_l2norm_cuda_custom(int chunk_size, NVTETensor noop_flag,
+                                          const NVTEDType input_dtype, const int64_t *addresses,
+                                          const int *sizes, const int *block_to_tensor,
+                                          const int *chunk_offsets, int total_chunks,
+                                          NVTETensor output,
+                                          NVTETensor ret, cudaStream_t stream);
+
+/*!  \brief Computes cumulative L2 norm for a list of tensors after unscaling from precomputed
+ *          chunk metadata.
+ *
+ * \warning   This API is **experimental** and subject to change.
+ */
+void nvte_multi_tensor_unscale_l2norm_cuda_custom(
+    int chunk_size, NVTETensor noop_flag, const NVTEDType input_dtype,
+    const int64_t *addresses, const int *sizes, const int *block_to_tensor,
+    const int *chunk_offsets, int total_chunks,
+    NVTETensor output, NVTETensor ret, NVTETensor inv_scale, cudaStream_t stream);
+
 /*!  \brief Compute and apply gradient update to parameters for Adam optimizer.
  *
  * \warning   This API is **experimental** and subject to change.
@@ -120,6 +144,35 @@ void nvte_multi_tensor_adam_param_remainder_cuda(
     const float epsilon, const int step, const int mode, const int bias_correction,
     const float weight_decay, cudaStream_t stream);
 
+/*!  \brief Compute and apply gradient update to parameters for Adam optimizer
+ *          where the master parameters only store the remainder bits.
+ *          Uses precomputed chunk metadata instead of TensorListMetadata.
+ *
+ * \warning   This API is **experimental** and subject to change.
+ */
+void nvte_multi_tensor_adam_param_remainder_cuda_custom(
+    int chunk_size, NVTETensor noop_flag, NVTEDType grad_dtype, NVTEDType moment_dtype,
+    int64_t *addresses, int64_t *sizes, int *block_to_tensor, int *chunk_offsets,
+    int total_chunks,
+    const float lr, const float beta1, const float beta2,
+    const float epsilon, const int step, const int mode, const int bias_correction,
+    const float weight_decay, cudaStream_t stream);
+
+/*!  \brief Compute and apply gradient update to parameters for Adam optimizer
+ *          (4-list: g, p, m, v).
+ *          Uses precomputed chunk metadata instead of TensorListMetadata.
+ *
+ * \warning   This API is **experimental** and subject to change.
+ */
+void nvte_multi_tensor_adam_cuda_custom(
+    int chunk_size, NVTETensor noop_flag, NVTEDType grad_dtype, NVTEDType param_dtype,
+    NVTEDType moment_dtype,
+    int64_t *addresses, int64_t *sizes, int *block_to_tensor, int *chunk_offsets,
+    int total_chunks, int has_master,
+    const float lr, const float beta1, const float beta2,
+    const float epsilon, const int step, const int mode, const int bias_correction,
+    const float weight_decay, cudaStream_t stream);
+
 /*!  \brief Compute and apply gradient update to parameters for Adam optimizer
  *          when model parameters are in Float8 precision.
  *