register softmax (apache#16)

nnvm/python/nnvm/top/nn.py

@@ -23,7 +23,6 @@ def compute_conv2d(attrs, inputs):
         out = topi.broadcast_add(out, bias)
     return out
 
-
 @reg.register_schedule("conv2d")
 def schedule_conv2d(_, outs, target):
     """Schedule definition of conv2d"""
@@ -33,3 +32,22 @@ def schedule_conv2d(_, outs, target):
     return tvm.create_schedule([x.op for x in outs])
 
 reg.register_pattern("conv2d", OpPattern.COMPLEX)
+
+
+# softmax
+@reg.register_compute("softmax")
+def compute_softmax(attrs, inputs):
+    """Compute definition of softmax"""
+    axis = attrs.get_int("axis")
+    assert axis == -1, "only support axis == -1 for now"
+    return topi.nn.softmax(inputs[0])
+
+@reg.register_schedule("softmax")
+def schedule_softmax(_, outs, target):
+    """Schedule definition of softmax"""
+    if target == "cuda":
+        return topi.cuda.schedule_softmax(outs)
+    # naive schedule
+    return tvm.create_schedule([x.op for x in outs])
+
+reg.register_pattern("softmax", OpPattern.COMPLEX)

nnvm/tests/python/compiler/test_top_level1.py

@@ -0,0 +1,46 @@
+import numpy as np
+
+import tvm
+import topi
+import nnvm.symbol as sym
+import nnvm.compiler
+import nnvm.runtime
+
+USE_GPU=True
+
+def default_target():
+    if USE_GPU:
+        return 'cuda'
+    else:
+        return 'llvm'
+
+def default_ctx():
+    if USE_GPU:
+        return tvm.gpu(0)
+    else:
+        return tvm.cpu(0)
+
+def test_softmax():
+    x = sym.Variable("x")
+    y = sym.softmax(x)
+    dtype = "float32"
+    dshape = (10, 1000)
+    oshape = dshape
+    graph, lib = nnvm.compiler.build(y, default_target(), {"x": dshape})
+    m = nnvm.runtime.create(graph, lib, default_ctx())
+    # get member functions
+    set_input, run, get_output = m["set_input"], m["run"], m["get_output"]
+    # set input
+    data = tvm.nd.array(np.random.uniform(size=dshape).astype(dtype))
+    set_input("x", data)
+    # execute
+    run()
+    # get outputs
+    out = tvm.nd.empty(oshape, dtype)
+    get_output(0, out)
+    y_np = topi.testing.softmax_python(data.asnumpy())
+    np.testing.assert_allclose(out.asnumpy(), y_np, rtol=1e-5)
+
+
+if __name__ == "__main__":
+    test_softmax()

nnvm/tests/python/unittest/test_top_level1.py

@@ -5,7 +5,7 @@ def test_dense():
     x1 = sym.dense(x, units=3, name="dense")
     x2 = sym.flatten(x1)
     x3 = sym.softmax(x2)
-    assert x2.list_input_names() == ['x', 'dense_weight', 'dense_bias']
+    assert x3.list_input_names() == ['x', 'dense_weight', 'dense_bias']
 
 
 def test_concatenate_split():