Fix bugs when bias add none in static graph for fused_attention op. (#37566) (#37608)

cherry-pick of PR #37566:

Based on #37411, this PR:

    Continue to fix the bugs when bias add is none in static graph for fused_attention op.
    Polish and improve the unittests in test_fused_attention_op_api.py.

python/paddle/fluid/tests/unittests/test_fused_attention_op_api.py

@@ -79,8 +79,12 @@ def compute_reference(pre_layer_norm, query, attn_mask, ln_scale, ln_bias,
     seq_len = query.shape[1]
     embed_dim = query.shape[2]
 
+    has_bias = True
+    if ln_bias is None:
+        has_bias = False
+
     if (pre_layer_norm):
-        ln_out = layer_norm(query, True, True, ln_scale, ln_bias)
+        ln_out = layer_norm(query, True, has_bias, ln_scale, ln_bias)
 
     num_head = qkv_weight.shape[1]
     head_dim = qkv_weight.shape[2]
@@ -89,17 +93,24 @@ def compute_reference(pre_layer_norm, query, attn_mask, ln_scale, ln_bias,
     qkv_weight = qkv_weight.reshape(qkv_weight.shape[0], qkv_weight.shape[1] *
                                     qkv_weight.shape[2] * qkv_weight.shape[3])
 
-    qkv_bias = qkv_bias.reshape(qkv_bias.shape[0] * qkv_bias.shape[1] *
-                                qkv_bias.shape[2])
+    if qkv_bias is not None:
+        qkv_bias = qkv_bias.reshape(qkv_bias.shape[0] * qkv_bias.shape[1] *
+                                    qkv_bias.shape[2])
     if (pre_layer_norm):
         ln_out = ln_out.reshape(batch_size * seq_len, embed_dim)
         qkv = fc(ln_out, qkv_weight)
-        qkv_bias_out = qkv + qkv_bias
+        if qkv_bias is not None:
+            qkv_bias_out = qkv + qkv_bias
+        else:
+            qkv_bias_out = qkv
         ln_out = ln_out.reshape(batch_size, seq_len, embed_dim)
     else:
         query = query.reshape(batch_size * seq_len, embed_dim)
         qkv = fc(query, qkv_weight)
-        qkv_bias_out = qkv + qkv_bias
+        if qkv_bias is not None:
+            qkv_bias_out = qkv + qkv_bias
+        else:
+            qkv_bias_out = qkv
         query = query.reshape(batch_size, seq_len, embed_dim)
 
     qkv_bias_out = qkv_bias_out.reshape(batch_size, seq_len, 3, num_head,
@@ -140,26 +151,42 @@ def compute_reference(pre_layer_norm, query, attn_mask, ln_scale, ln_bias,
     out_linear_out = fc(out_linear_input, out_linear_weight)
 
     # bias add, dropout, residual add, layer_norm.
-    out_linear_bias_out = out_linear_out + out_linear_bias
+    if out_linear_bias is not None:
+        out_linear_bias_out = out_linear_out + out_linear_bias
+    else:
+        out_linear_bias_out = out_linear_out
     out_linear_bias_dropout_out = out_linear_bias_out
     out_linear_bias_dropout_residual_out = query + out_linear_bias_dropout_out
     if not pre_layer_norm:
         out_linear_bias_dropout_residual_out = layer_norm(
-            out_linear_bias_dropout_residual_out, True, True, ln_2_scale,
+            out_linear_bias_dropout_residual_out, True, has_bias, ln_2_scale,
             ln_2_bias)
     return out_linear_bias_dropout_residual_out
 
 
 class TestFusedAttentionAPI(unittest.TestCase):
     def setUp(self):
+        self.setXType()
+        self.setPreLn()
+        self.setAttnMask()
+        self.setBiasAttr()
         self.config()
         self.generate_input_data()
 
-    def config(self):
+    def setAttnMask(self):
+        self.has_attn_mask = True
+
+    def setBiasAttr(self):
+        self.bias_attr = None
+
+    def setPreLn(self):
+        self.pre_layer_norm = False
+
+    def setXType(self):
         self.x_type = np.float32
+
+    def config(self):
         self.attn_mask_type = np.float64
-        self.pre_layer_norm = True
-        self.has_attn_mask = True
         self.training = True
         self.need_weight = False
 
@@ -172,7 +199,6 @@ class TestFusedAttentionAPI(unittest.TestCase):
         self.dropout_prob = 0.0
         self.attn_dropout_prob = 0.0
         self.weight_attr = None
-        self.bias_attr = None
 
         self.kdim, self.vdim = self.embed_dim, self.embed_dim
         self.key_length, self.value_length = self.query_length, self.query_length
@@ -205,23 +231,32 @@ class TestFusedAttentionAPI(unittest.TestCase):
             self.embed_dim, self.num_heads, self.dropout_prob,
             self.attn_dropout_prob, self.kdim, self.vdim, self.pre_layer_norm,
             self.need_weight, self.weight_attr, self.bias_attr)
-        qkv_bias = np.random.random(fused_attn.qkv_bias.shape).astype('float32')
-        fused_attn.qkv_bias.set_value(paddle.to_tensor(qkv_bias))
+        if self.bias_attr is not False:
+            qkv_bias = np.random.random(fused_attn.qkv_bias.shape).astype(
+                'float32')
+            fused_attn.qkv_bias.set_value(paddle.to_tensor(qkv_bias))
         out = fused_attn(
             paddle.to_tensor(self.query),
             paddle.to_tensor(self.query),
             paddle.to_tensor(self.query), attn_mask_tensor)
-        ref_out = compute_reference(self.pre_layer_norm, self.query,
-                                    self.attn_mask,
-                                    fused_attn.pre_ln_scale.numpy(),
-                                    fused_attn.pre_ln_bias.numpy(),
-                                    fused_attn.ln_scale.numpy(),
-                                    fused_attn.ln_bias.numpy(),
-                                    fused_attn.qkv_weight.numpy(),
-                                    fused_attn.qkv_bias.numpy(),
-                                    fused_attn.linear_weight.numpy(),
-                                    fused_attn.linear_bias.numpy())
-        np.testing.assert_allclose(ref_out, out.numpy(), rtol=1e-5, atol=1e-5)
+
+        fused_attn_qkv_bias = None
+        fused_attn_linear_bias = None
+        fused_attn_pre_ln_bias = None
+        fused_attn_ln_bias = None
+        if self.bias_attr is not False:
+            fused_attn_qkv_bias = fused_attn.qkv_bias.numpy()
+            fused_attn_linear_bias = fused_attn.linear_bias.numpy()
+            fused_attn_pre_ln_bias = fused_attn.pre_ln_bias.numpy()
+            fused_attn_ln_bias = fused_attn.ln_bias.numpy()
+
+        ref_out = compute_reference(
+            self.pre_layer_norm, self.query, self.attn_mask,
+            fused_attn.pre_ln_scale.numpy(), fused_attn_pre_ln_bias,
+            fused_attn.ln_scale.numpy(), fused_attn_ln_bias,
+            fused_attn.qkv_weight.numpy(), fused_attn_qkv_bias,
+            fused_attn.linear_weight.numpy(), fused_attn_linear_bias)
+        np.testing.assert_allclose(ref_out, out.numpy(), rtol=1e-5, atol=1e-4)
 
     def run_static(self):
         fused_attn = FusedMultiHeadAttention(
@@ -248,27 +283,53 @@ class TestFusedAttentionAPI(unittest.TestCase):
         place = paddle.CUDAPlace(0)
         exe = paddle.static.Executor(place)
         exe.run(paddle.static.default_startup_program())
+
+        qkv_bias = None
+        linear_bias = None
+        ln_bias = None
+        ln_2_bias = None
         if self.has_attn_mask:
-            out, qkv_weight, qkv_bias, out_linear_weight, linear_bias, ln_scale, ln_bias, ln_2_scale, ln_2_bias = exe.run(
-                paddle.static.default_main_program(),
-                feed={"X": self.query,
-                      "SrcMask": self.attn_mask},
-                fetch_list=[
-                    final_out, fused_attn.qkv_weight, fused_attn.qkv_bias,
-                    fused_attn.linear_weight, fused_attn.linear_bias,
-                    fused_attn.pre_ln_scale, fused_attn.pre_ln_bias,
-                    fused_attn.ln_scale, fused_attn.ln_bias
-                ])
+            if self.bias_attr is False:
+                out, qkv_weight, out_linear_weight, ln_scale, ln_2_scale = exe.run(
+                    paddle.static.default_main_program(),
+                    feed={"X": self.query,
+                          "SrcMask": self.attn_mask},
+                    fetch_list=[
+                        final_out, fused_attn.qkv_weight,
+                        fused_attn.linear_weight, fused_attn.pre_ln_scale,
+                        fused_attn.ln_scale
+                    ])
+            else:
+                out, qkv_weight, qkv_bias, out_linear_weight, linear_bias, ln_scale, ln_bias, ln_2_scale, ln_2_bias = exe.run(
+                    paddle.static.default_main_program(),
+                    feed={"X": self.query,
+                          "SrcMask": self.attn_mask},
+                    fetch_list=[
+                        final_out, fused_attn.qkv_weight, fused_attn.qkv_bias,
+                        fused_attn.linear_weight, fused_attn.linear_bias,
+                        fused_attn.pre_ln_scale, fused_attn.pre_ln_bias,
+                        fused_attn.ln_scale, fused_attn.ln_bias
+                    ])
         else:
-            out, qkv_weight, qkv_bias, out_linear_weight, linear_bias, ln_scale, ln_bias, ln_2_scale, ln_2_bias = exe.run(
-                paddle.static.default_main_program(),
-                feed={"X": self.query, },
-                fetch_list=[
-                    final_out, fused_attn.qkv_weight, fused_attn.qkv_bias,
-                    fused_attn.linear_weight, fused_attn.linear_bias,
-                    fused_attn.pre_ln_scale, fused_attn.pre_ln_bias,
-                    fused_attn.ln_scale, fused_attn.ln_bias
-                ])
+            if self.bias_attr is False:
+                out, qkv_weight, out_linear_weight, ln_scale, ln_2_scale = exe.run(
+                    paddle.static.default_main_program(),
+                    feed={"X": self.query, },
+                    fetch_list=[
+                        final_out, fused_attn.qkv_weight,
+                        fused_attn.linear_weight, fused_attn.pre_ln_scale,
+                        fused_attn.ln_scale
+                    ])
+            else:
+                out, qkv_weight, qkv_bias, out_linear_weight, linear_bias, ln_scale, ln_bias, ln_2_scale, ln_2_bias = exe.run(
+                    paddle.static.default_main_program(),
+                    feed={"X": self.query, },
+                    fetch_list=[
+                        final_out, fused_attn.qkv_weight, fused_attn.qkv_bias,
+                        fused_attn.linear_weight, fused_attn.linear_bias,
+                        fused_attn.pre_ln_scale, fused_attn.pre_ln_bias,
+                        fused_attn.ln_scale, fused_attn.ln_bias
+                    ])
         return out, qkv_weight, qkv_bias, out_linear_weight, linear_bias, ln_scale, ln_bias, ln_2_scale, ln_2_bias
 
     def test_static_api(self):
@@ -280,7 +341,7 @@ class TestFusedAttentionAPI(unittest.TestCase):
                                     self.attn_mask, ln_scale, ln_bias,
                                     ln_2_scale, ln_2_bias, qkv_weight, qkv_bias,
                                     linear_weight, linear_bias)
-        np.testing.assert_allclose(ref_out, out, rtol=1e-5, atol=1e-5)
+        np.testing.assert_allclose(ref_out, out, rtol=1e-5, atol=1e-4)
 
     def test_dynamic_api(self):
         paddle.disable_static(place=paddle.CUDAPlace(0))
@@ -288,27 +349,16 @@ class TestFusedAttentionAPI(unittest.TestCase):
 
 
 class TestFusedAttentionAPINoneAttnMask(TestFusedAttentionAPI):
-    def config(self):
-        self.x_type = np.float32
-        self.attn_mask_type = np.float64
-        self.pre_layer_norm = True
+    def setAttnMask(self):
         self.has_attn_mask = False
-        self.training = True
-        self.need_weight = False
 
-        self.batch_size = 1
-        self.query_length = 2
-        self.head_dim = 2
-        self.num_heads = 2
-        self.embed_dim = self.head_dim * self.num_heads
+    def setPreLn(self):
+        self.pre_layer_norm = True
 
-        self.dropout_prob = 0.0
-        self.attn_dropout_prob = 0.0
-        self.weight_attr = None
-        self.bias_attr = None
 
-        self.kdim, self.vdim = self.embed_dim, self.embed_dim
-        self.key_length, self.value_length = self.query_length, self.query_length
+class TestFusedAttentionAPIBiasIsNone(TestFusedAttentionAPI):
+    def setBiasAttr(self):
+        self.bias_attr = False
 
 
 if __name__ == "__main__":

python/paddle/incubate/nn/functional/fused_transformer.py

@@ -388,10 +388,12 @@ def fused_multi_head_attention(x,
         if pre_ln_bias:
             inputs['LnBias'] = [pre_ln_bias]
         inputs['QKVW'] = [qkv_weight]
-        inputs['QKVBias'] = [qkv_bias]
+        if qkv_bias is not None:
+            inputs['QKVBias'] = [qkv_bias]
         inputs['SrcMask'] = attn_mask
         inputs['OutLinearW'] = [linear_weight]
-        inputs['OutLinearBias'] = [linear_bias]
+        if linear_bias is not None:
+            inputs['OutLinearBias'] = [linear_bias]
         if ln_scale:
             inputs['Ln2Scale'] = [ln_scale]
         if ln_bias: