Enable keyword arguments for liger functional (#400)

## Summary
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this proposed code change. --->

This PR enables the keyword arguments of liger functional #368. 

<!---
## Details
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should be aware of?
--->

1. Warp the Liger Operator Functions (`torch.autograd.Function`) with an
extra layer that can take key word arguments.
2. For each of the liger functions, updating its unit test function
`test_{operator_name}.py::test_correctness_functional` to reflect that
keyword args can be accepted.

## Testing Done
<!--- This is a required section; please describe how this change was
tested. --->

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- Hardware Type:  A10G
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- [x] run `make test-convergence` to ensure convergence

---------

Signed-off-by: Hongpeng Guo <[email protected]>
Co-authored-by: Byron Hsu <[email protected]>

dev/modal/tests.py

@@ -14,7 +14,7 @@
 repo = modal.Mount.from_local_dir(ROOT_PATH, remote_path="/root/liger-kernel")
 
 
-@app.function(gpu="A10G", mounts=[repo], timeout=60 * 10)
+@app.function(gpu="A10G", mounts=[repo], timeout=60 * 15)
 def liger_tests():
     import subprocess
 

src/liger_kernel/transformers/functional.py

@@ -15,18 +15,6 @@
 from liger_kernel.ops.rope import LigerRopeFunction
 from liger_kernel.ops.swiglu import LigerSiLUMulFunction
 
-liger_swiglu = LigerSiLUMulFunction.apply
-liger_fused_linear_cross_entropy = LigerFusedLinearCrossEntropyFunction.apply
-liger_geglu = LigerGELUMulFunction.apply
-liger_rms_norm = LigerRMSNormFunction.apply
-liger_rope = LigerRopeFunction.apply
-liger_qwen2vl_mrope = LigerQwen2VLMRopeFunction.apply
-liger_layer_norm = LigerLayerNormFunction.apply
-liger_kl_div = LigerKLDivLossFunction.apply
-liger_jsd = LigerJSDFunction.apply
-liger_fused_linear_jsd = LigerFusedLinearJSDFunction.apply
-liger_group_norm = LigerGroupNormFunction.apply
-
 
 # conform to the function signature in https://pytorch.org/docs/stable/generated/torch.nn.functional.cross_entropy.html
 # `weight` and `size_average` are placeholders and not implemented yet
@@ -56,3 +44,130 @@ def liger_cross_entropy(
     if not return_z_loss:
         return loss
     return loss, z_loss
+
+
+def liger_fused_linear_cross_entropy(
+    input,
+    weight,
+    target,
+    bias=None,
+    ignore_index: int = -100,
+    lse_square_scale: float = 0.0,
+    label_smoothing: float = 0.0,
+    reduction: str = "mean",
+    softcap: Optional[float] = None,
+):
+    return LigerFusedLinearCrossEntropyFunction.apply(
+        input,
+        weight,
+        target,
+        bias,
+        ignore_index,
+        lse_square_scale,
+        label_smoothing,
+        reduction,
+        softcap,
+    )
+
+
+def liger_fused_linear_jsd(
+    student_input,
+    student_weight,
+    teacher_input,
+    teacher_weight,
+    shift_labels=None,
+    jsd_beta: float = 0.5,
+    ignore_index: int = -100,
+    temperature: float = 1.0,
+):
+    return LigerFusedLinearJSDFunction.apply(
+        student_input,
+        student_weight,
+        teacher_input,
+        teacher_weight,
+        shift_labels,
+        jsd_beta,
+        ignore_index,
+        temperature,
+    )
+
+
+def liger_geglu(a, b):
+    return LigerGELUMulFunction.apply(a, b)
+
+
+def liger_group_norm(
+    X,
+    affine_scaling_weight,
+    affine_shifting_bias,
+    num_channels,
+    num_groups,
+    eps,
+):
+    return LigerGroupNormFunction.apply(
+        X,
+        affine_scaling_weight,
+        affine_shifting_bias,
+        num_channels,
+        num_groups,
+        eps,
+    )
+
+
+def liger_jsd(
+    input,
+    target,
+    shift_labels=None,
+    beta: float = 0.5,
+    ignore_index: int = -100,
+):
+    return LigerJSDFunction.apply(
+        input,
+        target,
+        shift_labels,
+        beta,
+        ignore_index,
+    )
+
+
+# conform to the function signature in https://pytorch.org/docs/stable/generated/torch.nn.functional.kl_div.html#torch.nn.functional.kl_div
+# `size_average` and `mean` are being deprecated in torch API and are placeholders here
+def liger_kl_div(
+    input,
+    target,
+    size_average: bool = True,
+    reduce: bool = True,
+    reduction: str = "mean",
+    log_target: bool = False,
+    eps: float = 1e-10,
+):
+    # Note: the default reduction in torch is `mean`, but being `batchmean` in Liger
+    return LigerKLDivLossFunction.apply(
+        input,
+        target,
+        reduction,
+        log_target,
+        eps,
+    )
+
+
+def liger_layer_norm(X, W, B, eps):
+    return LigerLayerNormFunction.apply(X, W, B, eps)
+
+
+def liger_qwen2vl_mrope(q, k, cos, sin, mrope_section, unsqueeze_dim=1):
+    return LigerQwen2VLMRopeFunction.apply(q, k, cos, sin, mrope_section, unsqueeze_dim)
+
+
+def liger_rms_norm(
+    X, W, eps, offset: float = 0.0, casting_mode: str = "llama", in_place: bool = True
+):
+    return LigerRMSNormFunction.apply(X, W, eps, offset, casting_mode, in_place)
+
+
+def liger_rope(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    return LigerRopeFunction.apply(q, k, cos, sin, position_ids, unsqueeze_dim)
+
+
+def liger_swiglu(a, b):
+    return LigerSiLUMulFunction.apply(a, b)

test/transformers/test_fused_linear_cross_entropy.py

@@ -244,7 +244,12 @@ def test_correctness_functional(B, T, H, V, scalar, dtype, bias, atol, rtol):
     weight = torch.randn(V, H, device=device, dtype=dtype)
     bias = torch.randn(V, device=device, dtype=dtype) if bias else None
 
-    y1 = liger_fused_linear_cross_entropy(x1, weight, target, bias)
+    y1 = liger_fused_linear_cross_entropy(
+        input=x1,
+        weight=weight,
+        target=target,
+        bias=bias,
+    )
     y2 = LigerFusedLinearCrossEntropyFunction.apply(x2, weight, target, bias)
 
     assert torch.allclose(y1, y2, atol=atol, rtol=rtol)

test/transformers/test_fused_linear_jsd.py

@@ -296,14 +296,14 @@ def test_correctness_functional(
     label[indices_to_assign] = ignore_index
 
     output1 = liger_fused_linear_jsd(
-        _input1,
-        _weight1,
-        teacher_input,
-        teacher_weight,
-        label,
-        beta,
-        ignore_index,
-        temperature,
+        student_input=_input1,
+        student_weight=_weight1,
+        teacher_input=teacher_input,
+        teacher_weight=teacher_weight,
+        shift_labels=label,
+        jsd_beta=beta,
+        ignore_index=ignore_index,
+        temperature=temperature,
     )
     output2 = LigerFusedLinearJSDFunction.apply(
         _input2,

test/transformers/test_geglu.py

@@ -130,7 +130,7 @@ def test_correctness_functional(bsz, seq_len, size, dtype, atol, rtol):
     b1 = _b.clone().requires_grad_(True)
     b2 = _b.clone().requires_grad_(True)
 
-    y1 = liger_geglu(x1, b1)
+    y1 = liger_geglu(a=x1, b=b1)
     y2 = LigerGELUMulFunction.apply(x2, b2)
 
     assert torch.allclose(y1, y2, atol=atol, rtol=rtol)

test/transformers/test_jsd.py

@@ -229,7 +229,13 @@ def _test_correctness_functional(
     label[indices_to_assign] = ignore_index
 
     output = LigerJSDFunction.apply(x1, target, label, beta, ignore_index)
-    output2 = liger_jsd(x2, target, label, beta, ignore_index)
+    output2 = liger_jsd(
+        input=x2,
+        target=target,
+        shift_labels=label,
+        beta=beta,
+        ignore_index=ignore_index,
+    )
     assert torch.allclose(output, output2, atol=atol, rtol=rtol)
     if (
         not is_last_layer

test/transformers/test_layer_norm.py

@@ -83,7 +83,7 @@ def test_liger_layer_norm_functional(
     b1 = b.clone().requires_grad_(True)
     b2 = b.clone().requires_grad_(True)
 
-    y1 = liger_layer_norm(x1, w1, b1, 1e-6)
+    y1 = liger_layer_norm(X=x1, W=w1, B=b1, eps=1e-6)
     y2 = LigerLayerNormFunction.apply(x2, w2, b2, 1e-6)
 
     assert torch.allclose(y1, y2, atol=atol, rtol=rtol)

test/transformers/test_rms_norm.py

@@ -182,7 +182,7 @@ def test_correctness_functional(
 
     w = torch.randn(hd, device=device, dtype=dtype)
 
-    y1 = liger_rms_norm(h1, w, 1e-6, offset, casting_mode)
+    y1 = liger_rms_norm(X=h1, W=w, eps=1e-6, offset=offset, casting_mode=casting_mode)
     y2 = LigerRMSNormFunction.apply(h2, w, 1e-6, offset, casting_mode)
 
     assert torch.allclose(y1, y2, atol=atol, rtol=rtol)

test/transformers/test_rope.py

@@ -125,7 +125,7 @@ def test_functional_correctness(
     pos_ids = torch.arange(seq_len, device="cuda", dtype=torch.long).unsqueeze(0)
     cos, sin = rotary_emb(k1, pos_ids)
 
-    functional_q, functional_k = liger_rope(q1, k1, cos, sin)
+    functional_q, functional_k = liger_rope(q=q1, k=k1, cos=cos, sin=sin)
     class_q, class_k = LigerRopeFunction.apply(q2, k2, cos, sin)
 
     assert torch.allclose(functional_q, class_q, atol=atol, rtol=rtol)

test/transformers/test_swiglu.py

@@ -202,7 +202,7 @@ def test_correctness_functional(bsz, seq_len, size, dtype, atol, rtol):
     b1 = _b.clone().requires_grad_(True)
     b2 = _b.clone().requires_grad_(True)
 
-    y1 = liger_swiglu(x1, b1)
+    y1 = liger_swiglu(a=x1, b=b1)
     y2 = LigerSiLUMulFunction.apply(x2, b2)
 
     assert torch.allclose(y1, y2, atol=atol, rtol=rtol)