[KDA] Add Paddle training compatibility (#2)

Co-authored-by: huangjiyi <huangjiyi@users.noreply.github.com>

Author: huangjiyi

fla/__init__.py

@@ -5,40 +5,11 @@
 # For a list of all contributors, visit:
 #   https://github.com/fla-org/flash-linear-attention/graphs/contributors
 
-import importlib
 from pkgutil import extend_path
 
 __path__ = extend_path(__path__, __name__)
 __version__ = "0.5.2"
 
-__all__: list[str] = []
+from fla import modules, ops  # noqa: E402
 
-
-def _import_optional_public_module(module_name: str):
-    try:
-        return importlib.import_module(module_name)
-    except ModuleNotFoundError as exc:
-        missing = exc.name
-        # The extension package is optional. Treat its absence, or the absence
-        # of an external runtime dependency, as the extension being unavailable.
-        if missing == module_name or (missing is not None and missing.split('.', 1)[0] != 'fla'):
-            return None
-        raise
-
-
-def _export_public_api(module) -> None:
-    globals()[module.__name__.rsplit('.', maxsplit=1)[-1]] = module
-    for name in module.__all__:
-        if name.endswith('Config'):
-            continue
-        globals()[name] = getattr(module, name)
-        __all__.append(name)
-
-
-_layers = _import_optional_public_module('fla.layers')
-_models = _import_optional_public_module('fla.models')
-if _layers is not None and _models is not None:
-    _export_public_api(_layers)
-    _export_public_api(_models)
-
-del _import_optional_public_module, _export_public_api, _layers, _models
+__all__ = ["modules", "ops"]

fla/modules/__init__.py

@@ -5,48 +5,7 @@
 # For a list of all contributors, visit:
 #   https://github.com/fla-org/flash-linear-attention/graphs/contributors
 
-from fla.modules.convolution import ImplicitLongConvolution, LongConvolution, ShortConvolution
-from fla.modules.fused_bitlinear import BitLinear, FusedBitLinear
-from fla.modules.fused_cross_entropy import FusedCrossEntropyLoss
-from fla.modules.fused_kl_div import FusedKLDivLoss
-from fla.modules.fused_linear_cross_entropy import FusedLinearCrossEntropyLoss
-from fla.modules.fused_norm_gate import (
-    FusedLayerNormGated,
-    FusedLayerNormSwishGate,
-    FusedLayerNormSwishGateLinear,
-    FusedRMSNormGated,
-    FusedRMSNormSwishGate,
-    FusedRMSNormSwishGateLinear,
-)
-from fla.modules.l2norm import L2Norm
-from fla.modules.layernorm import GroupNorm, GroupNormLinear, LayerNorm, LayerNormLinear, RMSNorm, RMSNormLinear
-from fla.modules.mlp import GatedMLP
-from fla.modules.rotary import RotaryEmbedding
-from fla.modules.token_shift import TokenShift
+from fla.modules.conv.short_conv import ShortConvolution
+from fla.modules.fused_norm_gate import FusedRMSNormGated
 
-__all__ = [
-    'BitLinear',
-    'FusedBitLinear',
-    'FusedCrossEntropyLoss',
-    'FusedKLDivLoss',
-    'FusedLayerNormGated',
-    'FusedLayerNormSwishGate',
-    'FusedLayerNormSwishGateLinear',
-    'FusedLinearCrossEntropyLoss',
-    'FusedRMSNormGated',
-    'FusedRMSNormSwishGate',
-    'FusedRMSNormSwishGateLinear',
-    'GatedMLP',
-    'GroupNorm',
-    'GroupNormLinear',
-    'ImplicitLongConvolution',
-    'L2Norm',
-    'LayerNorm',
-    'LayerNormLinear',
-    'LongConvolution',
-    'RMSNorm',
-    'RMSNormLinear',
-    'RotaryEmbedding',
-    'ShortConvolution',
-    'TokenShift',
-]
+__all__ = ["FusedRMSNormGated", "ShortConvolution"]

fla/modules/backends/__init__.py

@@ -7,11 +7,8 @@
 
 """Module-level backends for FLA components such as rotary and cross-entropy."""
 
-from fla.modules.backends.triton_ascend import TritonAscendBackend
-from fla.ops.backends import BackendRegistry, dispatch
+from fla.ops.backends import dispatch
 
-modules_registry = BackendRegistry("modules")
-
-modules_registry.register(TritonAscendBackend())
+modules_registry = None
 
 __all__ = ['dispatch', 'modules_registry']

fla/modules/conv/causal_conv1d.py

@@ -9,6 +9,8 @@
 
 import torch
 
+from fla.modules.conv.cp import causal_conv1d_cp
+from fla.modules.conv.triton import CausalConv1dFunction
 from fla.ops.cp import FLACPContext
 from fla.utils import input_guard
 
@@ -65,11 +67,6 @@ def causal_conv1d(
         Tuple of (output, final_state).
         If `output_final_state` is `False`, the final state is `None`.
     """
-    # Import here to avoid circular dependencies
-    from fla.modules.conv.cp import causal_conv1d_cp
-    from fla.modules.conv.cuda import causal_conv1d_cuda, fast_causal_conv1d_fn
-    from fla.modules.conv.triton import CausalConv1dFunction
-
     if cp_context is not None:
         assert initial_state is None, "Initial state is not supported for CP"
         assert output_final_state is False, "Output final state is not supported for CP"
@@ -98,6 +95,8 @@ def causal_conv1d(
         )
         return y, final_state
     elif backend == 'mix':
+        from fla.modules.conv.cuda import fast_causal_conv1d_fn
+
         seq_idx = kwargs.get('seq_idx')
         return fast_causal_conv1d_fn(
             x,
@@ -113,6 +112,8 @@ def causal_conv1d(
             seq_idx=seq_idx,
         )
     elif backend == 'cuda':
+        from fla.modules.conv.cuda import causal_conv1d_cuda
+
         return causal_conv1d_cuda(
             x,
             weight,

fla/modules/conv/short_conv.py

@@ -7,6 +7,8 @@
 
 """Short convolution implementation for efficient causal convolutions."""
 
+from __future__ import annotations
+
 import warnings
 
 import torch

fla/modules/conv/triton/ops.py

@@ -61,7 +61,7 @@ def causal_conv1d_fwd(
     NT = len(chunk_indices) if cu_seqlens is not None else triton.cdiv(T, BT)
     NB = triton.cdiv(B*T, 1024)
 
-    y = torch.empty_like(x, memory_format=torch.contiguous_format)
+    y = torch.empty_like(x)
 
     def grid(meta): return (triton.cdiv(D, meta['BD']), NT, B)
     causal_conv1d_fwd_kernel[grid](
@@ -378,6 +378,12 @@ def forward(
         chunk_indices: torch.LongTensor | None = None,
         chunk_size: int = 64,
     ):
+        ctx.has_bias = bias is not None
+        ctx.has_residual = residual is not None
+        ctx.has_initial_state = initial_state is not None
+        ctx.has_cu_seqlens = cu_seqlens is not None
+        ctx.has_cu_seqlens_cpu = cu_seqlens_cpu is not None
+        ctx.has_chunk_indices = chunk_indices is not None
         BT = chunk_size
         if cu_seqlens is not None and chunk_indices is None:
             chunk_indices = prepare_chunk_indices(cu_seqlens, BT, cu_seqlens_cpu=cu_seqlens_cpu)
@@ -421,4 +427,12 @@ def backward(ctx, dy: torch.Tensor, dht: torch.Tensor | None = None):
             chunk_indices=ctx.chunk_indices,
             layout_fallback=ctx.layout_fallback,
         )
-        return dx, dw, db, dr, dh0, None, None, None, None, None, None
+        return (
+            (dx, dw)
+            + ((db,) if ctx.has_bias else ())
+            + ((dr,) if ctx.has_residual else ())
+            + ((dh0,) if ctx.has_initial_state else ())
+            + ((None,) if ctx.has_cu_seqlens else ())
+            + ((None,) if ctx.has_cu_seqlens_cpu else ())
+            + ((None,) if ctx.has_chunk_indices else ())
+        )

fla/modules/fused_norm_gate.py

@@ -656,6 +656,7 @@ def forward(
         residual_in_fp32: bool = False,
         is_rms_norm: bool = False,
     ):
+        ctx.has_bias = bias is not None
         x_shape_og = x.shape
         g_shape_og = g.shape
         # reshape input data into 2D tensor
@@ -716,16 +717,9 @@ def backward(ctx, dy, *args):
             x_dtype=ctx.x_dtype,
         )
         return (
-            dx.reshape(ctx.x_shape_og),
-            dg.reshape(ctx.g_shape_og),
-            dw,
-            db,
-            None,
-            dres_in.reshape(ctx.x_shape_og) if ctx.has_residual else None,
-            None,
-            None,
-            None,
-            None,
+            (dx.reshape(ctx.x_shape_og), dg.reshape(ctx.g_shape_og), dw)
+            + ((db,) if ctx.has_bias else ())
+            + ((dres_in.reshape(ctx.x_shape_og),) if ctx.has_residual else ())
         )
 
 

fla/ops/__init__.py

@@ -5,87 +5,6 @@
 # For a list of all contributors, visit:
 #   https://github.com/fla-org/flash-linear-attention/graphs/contributors
 
-from .abc import chunk_abc
-from .attn import parallel_attn
-from .attnres import fused_attnres
-from .based import fused_chunk_based, parallel_based
-from .comba import chunk_comba, fused_recurrent_comba
-from .delta_rule import chunk_delta_rule, fused_chunk_delta_rule, fused_recurrent_delta_rule
-from .forgetting_attn import parallel_forgetting_attn
-from .gated_delta_rule import chunk_gated_delta_rule, chunk_gdn, fused_recurrent_gated_delta_rule, fused_recurrent_gdn
-from .generalized_delta_rule import (
-    chunk_dplr_delta_rule,
-    chunk_iplr_delta_rule,
-    fused_recurrent_dplr_delta_rule,
-    fused_recurrent_iplr_delta_rule,
-)
-from .gla import chunk_gla, fused_chunk_gla, fused_recurrent_gla
-from .gsa import chunk_gsa, fused_recurrent_gsa
-from .hgrn import fused_recurrent_hgrn
-from .kda import chunk_kda, fused_recurrent_kda
-from .lightning_attn import chunk_lightning_attn, fused_recurrent_lightning_attn
-from .linear_attn import chunk_linear_attn, fused_chunk_linear_attn, fused_recurrent_linear_attn
-from .log_linear_attn import chunk_log_linear_attn
-from .mesa_net import chunk_mesa_net
-from .nsa import parallel_nsa
-from .parallax import parallel_parallax
-from .path_attn import parallel_path_attn
-from .retention import chunk_retention, fused_chunk_retention, fused_recurrent_retention, parallel_retention
-from .rwkv6 import chunk_rwkv6, fused_recurrent_rwkv6
-from .rwkv7 import chunk_rwkv7, fused_recurrent_rwkv7
-from .simple_gla import chunk_simple_gla, fused_chunk_simple_gla, fused_recurrent_simple_gla, parallel_simple_gla
-from .wall_attn import parallel_wall_attn, parallel_wall_attn_decode
+from fla.ops import cp, kda, utils
 
-__all__ = [
-    'chunk_abc',
-    'chunk_comba',
-    'chunk_delta_rule',
-    'chunk_dplr_delta_rule',
-    'chunk_gated_delta_rule',
-    'chunk_gdn',
-    'chunk_gla',
-    'chunk_gsa',
-    'chunk_iplr_delta_rule',
-    'chunk_kda',
-    'chunk_lightning_attn',
-    'chunk_linear_attn',
-    'chunk_log_linear_attn',
-    'chunk_mesa_net',
-    'chunk_retention',
-    'chunk_rwkv6',
-    'chunk_rwkv7',
-    'chunk_simple_gla',
-    'fused_attnres',
-    'fused_chunk_based',
-    'fused_chunk_delta_rule',
-    'fused_chunk_gla',
-    'fused_chunk_linear_attn',
-    'fused_chunk_retention',
-    'fused_chunk_simple_gla',
-    'fused_recurrent_comba',
-    'fused_recurrent_delta_rule',
-    'fused_recurrent_dplr_delta_rule',
-    'fused_recurrent_gated_delta_rule',
-    'fused_recurrent_gdn',
-    'fused_recurrent_gla',
-    'fused_recurrent_gsa',
-    'fused_recurrent_hgrn',
-    'fused_recurrent_iplr_delta_rule',
-    'fused_recurrent_kda',
-    'fused_recurrent_lightning_attn',
-    'fused_recurrent_linear_attn',
-    'fused_recurrent_retention',
-    'fused_recurrent_rwkv6',
-    'fused_recurrent_rwkv7',
-    'fused_recurrent_simple_gla',
-    'parallel_attn',
-    'parallel_based',
-    'parallel_forgetting_attn',
-    'parallel_nsa',
-    'parallel_parallax',
-    'parallel_path_attn',
-    'parallel_retention',
-    'parallel_simple_gla',
-    'parallel_wall_attn',
-    'parallel_wall_attn_decode',
-]
+__all__ = ["cp", "kda", "utils"]

fla/ops/backends/__init__.py

@@ -164,6 +164,8 @@ def dispatch(operation: str):
     that passes the verifier for the given function call.
     """
     def decorator(func: F) -> F:
+        return func
+
         if _DISPATCH_DISABLED:
             return func
         func_name = func.__name__

fla/ops/common/gate.py

@@ -57,7 +57,7 @@ def fused_beta_sigmoid_bwd_kernel(
 @dispatch('common')
 def fused_beta_sigmoid_fwd(x: torch.Tensor, scale: float = 1.0) -> torch.Tensor:
     y = torch.empty_like(x, dtype=torch.float32)
-    n_elements = x.numel()
+    n_elements = x.shape.numel()
     grid = (triton.cdiv(n_elements, _BETA_SIGMOID_BLOCK_SIZE),)
     fused_beta_sigmoid_fwd_kernel[grid](
         x,
@@ -73,7 +73,7 @@ def fused_beta_sigmoid_fwd(x: torch.Tensor, scale: float = 1.0) -> torch.Tensor:
 @dispatch('common')
 def fused_beta_sigmoid_bwd(x: torch.Tensor, dy: torch.Tensor, scale: float = 1.0) -> torch.Tensor:
     dx = torch.empty_like(x)
-    n_elements = x.numel()
+    n_elements = x.shape.numel()
     grid = (triton.cdiv(n_elements, _BETA_SIGMOID_BLOCK_SIZE),)
     fused_beta_sigmoid_bwd_kernel[grid](
         x,
@@ -103,7 +103,7 @@ def forward(ctx, x: torch.Tensor, scale: float = 1.0) -> torch.Tensor:
     def backward(ctx, dy: torch.Tensor):
         (x,) = ctx.saved_tensors
         dx = fused_beta_sigmoid_bwd(x, dy, ctx.scale)
-        return dx.type_as(x), None
+        return (dx.type_as(x),)
 
 
 def fused_beta_sigmoid(x: torch.Tensor, scale: float = 1.0) -> torch.Tensor: