[Frontend][PaddlePaddle] Add topk op and Fix bug, when the output is a dimension, it …

python/tvm/relay/frontend/paddlepaddle.py

@@ -1884,7 +1884,8 @@ def convert_slice(g, op, block):
         strides = _op.const([1] * dims, dtype="int64")
 
     out = _op.strided_slice(data, begin=starts, end=ends, strides=strides)
-    if decrease_axis:
+    out_shape = infer_shape(out)
+    if decrease_axis and len(out_shape) > 1:
         out = _op.squeeze(out, axis=decrease_axis)
     g.add_node(op.output("Out")[0], out)
 
@@ -1998,6 +1999,37 @@ def convert_swish(g, op, block):
     g.add_node(op.output("Out")[0], out)
 
 
+def convert_topk(g, op, block):
+    """Operator converter for topk."""
+
+    data = g.get_node(op.input("X")[0])
+    if op.input("K"):
+        k = g.get_node(op.input("K")[0])
+    else:
+        k = op.attr("k")
+
+    largest = op.attr("largest")
+    is_ascend = not largest
+    axis = op.attr("axis")
+
+    value_names = op.output("Out")
+    indice_names = op.output("Indices")
+
+    out = None
+    indice = None
+    if value_names and indice_names:
+        out, indice = _op.topk(data=data, k=k, axis=axis, ret_type="both", is_ascend=is_ascend)
+    elif value_names:
+        out = _op.topk(data=data, k=k, axis=axis, ret_type="values", is_ascend=is_ascend)
+    elif indice_names:
+        indice = _op.topk(data=data, k=k, axis=axis, ret_type="indices", is_ascend=is_ascend)
+
+    if out is not None:
+        g.add_node(value_names[0], out)
+    if indice is not None:
+        g.add_node(indice_names[0], indice)
+
+
 def convert_transpose(g, op, block):
     """Operator converter for transpose."""
 
@@ -2148,6 +2180,7 @@ def convert_unsqueeze(g, op, block):
     "swish": convert_swish,
     "tan": convert_unary_op,
     "tanh": convert_unary_op,
+    "top_k_v2": convert_topk,
     "transpose2": convert_transpose,
     "unsqueeze2": convert_unsqueeze,
 }

tests/python/frontend/paddlepaddle/test_forward.py

@@ -1351,6 +1351,11 @@ def slice4(inputs):
         x1 = paddle.to_tensor([3]) + paddle.to_tensor([1])
         return inputs[:, x0:, 1:x1, :]
 
+    @paddle.jit.to_static
+    def slice5(inputs):
+        b, c, h, w = paddle.shape(inputs)  # add decrease_axis
+        return h
+
     input_shape = [1, 3, 10, 10]
     input_data = paddle.rand(input_shape, dtype="float32")
     verify_model(
@@ -1362,6 +1367,7 @@ def slice4(inputs):
     verify_model(slice2, input_data=input_data)
     verify_model(slice3, input_data=paddle.randn((4, 4)))
     verify_model(slice4, input_data=input_data)
+    verify_model(slice5, input_data=input_data)
 
 
 @tvm.testing.uses_gpu
@@ -1681,5 +1687,15 @@ def forward(self, inputs, prev_h):
         )
 
 
+@tvm.testing.uses_gpu
+def test_forward_topk():
+    @paddle.jit.to_static
+    def topk1(inputs):
+        return paddle.topk(inputs, k=1)
+
+    input_data = paddle.to_tensor([1, 4, 5, 7])
+    verify_model(topk1, input_data=input_data)
+
+
 if __name__ == "__main__":
     pytest.main([__file__])