Add API paddle.neg() and paddle.lgamma(), along with some unittests for paddle.neg().

python/paddle/__init__.py

@@ -207,6 +207,7 @@
 from .tensor.math import broadcast_shape  # noqa: F401
 from .tensor.math import conj  # noqa: F401
 from .tensor.math import neg  # noqa: F401
+from .tensor.math import lgamma  # noqa: F401
 
 from .tensor.random import multinomial  # noqa: F401
 from .tensor.random import standard_normal  # noqa: F401
@@ -424,6 +425,7 @@
            'broadcast_shape',
            'conj',
            'neg',
+           'lgamma',
            'square',
            'divide',
            'ceil',

python/paddle/fluid/layers/ops.py

@@ -53,6 +53,7 @@
     'round',
     'reciprocal',
     'square',
+    'lgamma',
 ]
 
 __inplace_unary_func__ = [
@@ -396,6 +397,19 @@
 
 """)
 
+add_sample_code(globals()["lgamma"], r"""
+Examples:
+    .. code-block:: python
+
+        import paddle
+
+        x = paddle.to_tensor([-0.4, -0.2, 0.1, 0.3])
+        out = paddle.lgamma(x)
+        print(out)
+        # [1.31452441, 1.76149750, 2.25271273, 1.09579802]
+
+""")
+
 add_sample_code(globals()["softplus"], r"""
 Examples:
     .. code-block:: python

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

@@ -20,7 +20,7 @@
 class TestNegOp(unittest.TestCase):
     def setUp(self):
         self.init_dtype_type()
-        self.input = np.random.random((32, 8)).astype(self.dtype)
+        self.input = (np.random.random((32, 8)) * 100).astype(self.dtype)
 
     def init_dtype_type(self):
         self.dtype = np.float64

python/paddle/tensor/__init__.py

@@ -163,6 +163,8 @@
 from .math import any  # noqa: F401
 from .math import broadcast_shape  # noqa: F401
 from .math import conj  # noqa: F401
+from .math import neg  # noqa: F401
+from .math import lgamma  # noqa: F401
 
 from .random import multinomial  # noqa: F401
 from .random import standard_normal  # noqa: F401
@@ -280,6 +282,8 @@
            'isnan',
            'broadcast_shape',
            'conj',
+           'neg',
+           'lgamma',
            'equal',
            'equal_all',
            'greater_equal',

python/paddle/tensor/math.py

@@ -62,6 +62,7 @@
 from ..fluid.layers import sqrt    # noqa: F401
 from ..fluid.layers import sqrt_    # noqa: F401
 from ..fluid.layers import sin    # noqa: F401
+from ..fluid.layers import lgamma    # noqa: F401
 
 from ..fluid.layers import multiplex    # noqa: F401
 from ..fluid import layers
@@ -2290,7 +2291,7 @@ def neg(x, name=None):
         name (str, optional): Name for the operation (optional, default is None). For more information, please refer to :ref:`api_guide_Name`.
 
     Returns:
-        out (Tensor): The negative of input. The shape and data type are the same with input.
+        out (Tensor): The negative of input Tensor. The shape and data type are the same with input Tensor.
 
     Examples:
         .. code-block:: python