[Paddle] Fix issues (#515)

* fix cudnn FA softmax shape
Signed-off-by: Shijie Wang <jaywan@nvidia.com>

* set inplace rng_state
Signed-off-by: Shijie Wang <jaywan@nvidia.com>

---------
Signed-off-by: Shijie Wang <jaywan@nvidia.com>

transformer_engine/paddle/cpp_extensions.py

@@ -472,7 +472,12 @@ def fused_attn_fwd_qkvpacked(
         out = paddle.empty(shape=[b, max_seqlen, h, d], dtype=qkv.dtype)
 
     if is_training:
+        if fused_attention_backend == FusedAttnBackend["F16_max512_seqlen"]:
             softmax_aux = paddle.empty(shape=[b, h, max_seqlen, max_seqlen], dtype=qkv.dtype)
+        elif fused_attention_backend == FusedAttnBackend["F16_arbitrary_seqlen"]:
+            softmax_aux = paddle.empty(shape=[b, h, max_seqlen, 1], dtype='float32')
+        else:
+            raise ValueError("Unsupported fused attention backend.")
     else:
         softmax_aux = None
 
@@ -631,7 +636,12 @@ def fused_attn_fwd_kvpacked(
         out = paddle.empty(shape=[b, max_seqlen_q, h, d], dtype=q.dtype)
 
     if is_training:
+        if fused_attention_backend == FusedAttnBackend["F16_max512_seqlen"]:
             softmax_aux = paddle.empty(shape=[b, h, max_seqlen_q, max_seqlen_kv], dtype=q.dtype)
+        elif fused_attention_backend == FusedAttnBackend["F16_arbitrary_seqlen"]:
+            softmax_aux = paddle.empty(shape=[b, h, max_seqlen_q, 1], dtype='float32')
+        else:
+            raise ValueError("Unsupported fused attention backend.")
     else:
         softmax_aux = None
 

transformer_engine/paddle/csrc/custom_ops.cu

@@ -1271,14 +1271,15 @@ PD_BUILD_OP(te_rmsnorm_bwd)
 
 PD_BUILD_OP(te_fused_attn_fwd_qkvpacked)
     .Inputs({"QKV", "cu_seqlens", paddle::Optional("Bias"), "_O", paddle::Optional("_softmax_aux"),
-             "rng_state"})
-    .Outputs({"O", paddle::Optional("softmax_aux")})
+             "_rng_state"})
+    .Outputs({"O", paddle::Optional("softmax_aux"), "rng_state"})
     .Attrs({"b: int64_t", "h: int64_t", "d: int64_t", "total_seqs: int64_t", "max_seqlen: int64_t",
             "is_training: bool", "attn_scale: float", "p_dropout: float", "qkv_layout: std::string",
             "bias_type: std::string", "attn_mask_type: std::string", "qkv_type: int64_t",
             "rng_elts_per_thread: int64_t"})
     .SetInplaceMap({{"_O", "O"},
-                    {paddle::Optional("_softmax_aux"), paddle::Optional("softmax_aux")}})
+                    {paddle::Optional("_softmax_aux"), paddle::Optional("softmax_aux")},
+                    {"_rng_state", "rng_state"}})
     .SetKernelFn(PD_KERNEL(transformer_engine::paddle_ext::te_fused_attn_fwd_qkvpacked));
 
 PD_BUILD_OP(te_fused_attn_bwd_qkvpacked)
@@ -1293,15 +1294,16 @@ PD_BUILD_OP(te_fused_attn_bwd_qkvpacked)
 
 PD_BUILD_OP(te_fused_attn_fwd_kvpacked)
     .Inputs({"Q", "KV", "cu_seqlens_q", "cu_seqlens_kv", paddle::Optional("Bias"), "_O",
-             paddle::Optional("_softmax_aux"), "rng_state"})
-    .Outputs({"O", paddle::Optional("softmax_aux")})
+             paddle::Optional("_softmax_aux"), "_rng_state"})
+    .Outputs({"O", paddle::Optional("softmax_aux"), "rng_state"})
     .Attrs({"b: int64_t", "h: int64_t", "d: int64_t", "total_seqs_q: int64_t",
             "total_seqs_kv: int64_t", "max_seqlen_q: int64_t", "max_seqlen_kv: int64_t",
             "is_training: bool", "attn_scale: float", "p_dropout: float", "qkv_layout: std::string",
             "bias_type: std::string", "attn_mask_type: std::string", "qkv_type: int64_t",
             "rng_elts_per_thread: int64_t"})
     .SetInplaceMap({{"_O", "O"},
-                    {paddle::Optional("_softmax_aux"), paddle::Optional("softmax_aux")}})
+                    {paddle::Optional("_softmax_aux"), paddle::Optional("softmax_aux")},
+                    {"_rng_state", "rng_state"}})
     .SetKernelFn(PD_KERNEL(transformer_engine::paddle_ext::te_fused_attn_fwd_kvpacked));
 
 PD_BUILD_OP(te_fused_attn_bwd_kvpacked)