diff --git a/include/tvm/buffer.h b/include/tvm/buffer.h
index 2e4d7debcf42..7f8f5c0cc131 100644
--- a/include/tvm/buffer.h
+++ b/include/tvm/buffer.h
@@ -61,7 +61,7 @@ class BufferNode : public Node {
   /*! \brief optional name of the buffer */
   std::string name;
   /*! \brief The pointer to the head of the data */
-  Var ptr;
+  Var data;
   /*! \brief The shape of the buffer */
   Array<Expr> shape;
   /*!
@@ -77,7 +77,7 @@ class BufferNode : public Node {
 
   void VisitAttrs(AttrVisitor* v) final {
     v->Visit("name", &name);
-    v->Visit("ptr", &ptr);
+    v->Visit("data", &data);
     v->Visit("shape", &shape);
     v->Visit("strides", &strides);
     v->Visit("dtype", &dtype);
diff --git a/python/tvm/__init__.py b/python/tvm/__init__.py
index a1e2d4ff483b..c676e5cfeb67 100644
--- a/python/tvm/__init__.py
+++ b/python/tvm/__init__.py
@@ -17,3 +17,4 @@
 
 from ._base import TVMError
 from .api import *
+from .build import build
diff --git a/python/tvm/api.py b/python/tvm/api.py
index 7c7a5b33c4f9..85009186646a 100644
--- a/python/tvm/api.py
+++ b/python/tvm/api.py
@@ -145,7 +145,7 @@ def Buffer(shape, dtype=None,
            name="buffer",
            ptr=None,
            strides=None):
-    """Create a new buffer
+    """Create a new symbolic buffer
 
     Parameters
     ----------
diff --git a/python/tvm/build.py b/python/tvm/build.py
new file mode 100644
index 000000000000..407a1ba146aa
--- /dev/null
+++ b/python/tvm/build.py
@@ -0,0 +1,83 @@
+"""The build pipeline in python.
+
+Eventually some of these pipelines will be moved to C++.
+But the first pipeline will be kept in python for ease of change and evolving.
+"""
+# pylint: disable=invalid-name, no-member, too-many-locals, too-many-arguments
+
+from . import api
+from . import tensor
+from . import schedule
+from . import expr
+from . import ir_pass
+from . import codegen
+
+def build(sch,
+          args,
+          target,
+          name="default_function",
+          binds=None,
+          record_codes=None):
+    """Build a function with arguments as signiture.
+
+    Parameters
+    ----------
+    sch : tvm.Schedule
+        The schedule to be builded
+
+    args : list of Buffer or Tensor or Var
+        The argument lists to the function.
+
+    target : str
+        The target of the compilation.
+
+    name : str
+        The name of result function.
+
+    binds : dict, optional
+        Dictionary that maps the binding of symbolic buffer to Tensor.
+        By default, a new buffer is created for each tensor in the argument.
+
+    Returns
+    -------
+    f : Function, or pair of functions
+       The result function.
+       If the function requires host space allocation,
+       a pair of functions will be returned.
+    """
+    binds = {} if binds is None else binds.copy()
+    arg_list = []
+    for x in args:
+        if isinstance(x, tensor.Tensor):
+            buf = api.Buffer(x.shape, dtype=x.dtype, name=x.op.name)
+            assert x not in binds
+            binds[x] = buf
+            arg_list.append(buf)
+        elif isinstance(x, schedule.Buffer):
+            arg_list.append(x)
+        elif isinstance(x, expr.Var):
+            arg_list.append(x)
+        else:
+            raise ValueError("args must be Tensor, Buffer or Var")
+
+    # lowering
+    bounds = schedule.InferBound(sch)
+    stmt = ir_pass.ScheduleOps(sch, bounds)
+    stmt = ir_pass.StorageFlatten(stmt, binds)
+    stmt = ir_pass.Simplify(stmt)
+    fapi = codegen.MakeAPI(stmt, name, arg_list, len(arg_list))
+    fsplits = codegen.SplitHostDevice(fapi)
+
+    if record_codes is not None:
+        output_ssa = False
+        for i, f in enumerate(fsplits):
+            t = target if i >= 1 else "c"
+            record_codes.append(codegen.CompileToC(f, output_ssa, t))
+
+    if target == "cuda":
+        ret = codegen.BuildNVRTC(fsplits, "stackvm")
+    elif target == "opencl":
+        ret = codegen.BuildOpenCL(fsplits, "stackvm")
+    else:
+        raise ValueError("Unknown target %s" % target)
+    return ret
diff --git a/python/tvm/collections.py b/python/tvm/collections.py
index c24b1d81b58f..f92275f06b05 100644
--- a/python/tvm/collections.py
+++ b/python/tvm/collections.py
@@ -58,12 +58,6 @@ class IterVar(NodeBase, _expr.ExprOp):
     pass
 
 
-@register_node
-class Buffer(NodeBase):
-    """Represent a Buffer in TVM."""
-    pass
-
-
 @register_node
 class LoweredFunc(NodeBase):
     """Represent a LoweredFunc in TVM."""
diff --git a/python/tvm/schedule.py b/python/tvm/schedule.py
index da5413e625f9..41a6afded977 100644
--- a/python/tvm/schedule.py
+++ b/python/tvm/schedule.py
@@ -5,6 +5,11 @@
 from . import _api_internal
 from . import tensor as _tensor
 
+@register_node
+class Buffer(NodeBase):
+    """Represent a Buffer in TVM."""
+    pass
+
 @register_node
 class Split(NodeBase):
     """Split operation on axis."""
diff --git a/src/codegen/make_api.cc b/src/codegen/make_api.cc
index 227faf37f410..3c1324a9aa6f 100644
--- a/src/codegen/make_api.cc
+++ b/src/codegen/make_api.cc
@@ -138,9 +138,9 @@ LoweredFunc MakeAPI(Stmt body,
                    UIntImm::make(UInt(16), dtype.lanes()));
       seq_init.emplace_back(AssertStmt::make(cond, type_err_msg.str()));
       // Data Field
-      if (f_push(buf->ptr, TVMArrayGet(Handle(), v_arg, intrinsic::kData),
+      if (f_push(buf->data, TVMArrayGet(Handle(), v_arg, intrinsic::kData),
                  v_arg->name_hint + ".data")) {
-        Var vptr(buf->ptr);
+        Var vptr(buf->data);
         handle_data_type.Set(vptr, make_const(buf->dtype, 0));
       }
       // shape field
diff --git a/src/lang/buffer.cc b/src/lang/buffer.cc
index b44bca783834..8bbff8693921 100644
--- a/src/lang/buffer.cc
+++ b/src/lang/buffer.cc
@@ -45,23 +45,23 @@ inline Expr BufferOffset(const BufferNode* n, Array<Expr> index) {
 
 Expr Buffer::MakeLoad(Array<Expr> index) const {
   const BufferNode* n = operator->();
-  return ir::Load::make(n->dtype, n->ptr, BufferOffset(n, index));
+  return ir::Load::make(n->dtype, n->data, BufferOffset(n, index));
 }
 
 Stmt Buffer::MakeStore(Array<Expr> index, Expr value) const {
   const BufferNode* n = operator->();
   CHECK_EQ(value.type(), n->dtype);
-  return ir::Store::make(n->ptr, value, BufferOffset(n, index));
+  return ir::Store::make(n->data, value, BufferOffset(n, index));
 }
 
 Buffer BufferNode::make(std::string name,
-                        Var ptr,
+                        Var data,
                         Array<Expr> shape,
                         Array<Expr> strides,
                         Type dtype) {
   auto n = std::make_shared<BufferNode>();
   n->name = name;
-  n->ptr = ptr;
+  n->data = data;
   n->shape = shape;
   n->strides = strides;
   n->dtype = dtype;
diff --git a/src/pass/storage_flatten.cc b/src/pass/storage_flatten.cc
index 6058b6907fe7..ab344fcc0f3c 100644
--- a/src/pass/storage_flatten.cc
+++ b/src/pass/storage_flatten.cc
@@ -138,7 +138,7 @@ class StorageFlattener : public IRMutator {
       buf_map_[key].released = true;
 
       return Allocate::make(
-          e.buffer->ptr, e.buffer->dtype, e.buffer->shape,
+          e.buffer->data, e.buffer->dtype, e.buffer->shape,
           make_const(Bool(e.buffer->dtype.lanes()), true), body);
     }
   }
diff --git a/tests/python/integration/test_ewise.py b/tests/python/integration/test_ewise.py
new file mode 100644
index 000000000000..0395d633b5ed
--- /dev/null
+++ b/tests/python/integration/test_ewise.py
@@ -0,0 +1,44 @@
+import tvm
+import numpy as np
+
+def test_add():
+    # graph
+    n = tvm.Var('n')
+    A = tvm.placeholder((n,), name='A')
+    B = tvm.placeholder((n,), name='B')
+    C = tvm.compute(A.shape, lambda *i: A(*i) + B(*i), name='C')
+    # schedule
+    s = tvm.Schedule(C.op)
+    # create iter var and assign them tags.
+    num_thread = 256
+    block_x = tvm.IterVar(thread_tag="blockIdx.x")
+    thread_x = tvm.IterVar((0, num_thread), thread_tag="threadIdx.x")
+    _, x = s[C].split(C.op.axis[0], factor=num_thread, outer=block_x)
+    _, x = s[C].split(x, outer=thread_x)
+
+    # one line to build the function.
+    codes = []
+    fadd = tvm.build(s, args=[A, B, C],
+                     target="cuda", name="myadd",
+                     record_codes=codes)
+    for c in codes:
+        print(c)
+
+    # call the function
+    num_device = 1
+    for i in range(num_device):
+        ctx = tvm.gpu(i)
+        if not ctx.enabled:
+            continue
+        # launch the kernel.
+        n = 1027
+        a = tvm.nd.array(np.random.uniform(size=n).astype(A.dtype), ctx)
+        b = tvm.nd.array(np.random.uniform(size=n).astype(B.dtype), ctx)
+        c = tvm.nd.array(np.zeros(n, dtype=C.dtype), ctx)
+        fadd(a, b, c)
+        np.testing.assert_allclose(
+            c.asnumpy(), a.asnumpy() + b.asnumpy())
+
+
+if __name__ == "__main__":
+    test_add()
diff --git a/tests/python/test_codegen_device.py b/tests/python/unittest/test_codegen_device.py
similarity index 100%
rename from tests/python/test_codegen_device.py
rename to tests/python/unittest/test_codegen_device.py
diff --git a/tests/python/test_codegen_makeapi.py b/tests/python/unittest/test_codegen_makeapi.py
similarity index 93%
rename from tests/python/test_codegen_makeapi.py
rename to tests/python/unittest/test_codegen_makeapi.py
index ebe6f4e63da5..fd6522a2d50c 100644
--- a/tests/python/test_codegen_makeapi.py
+++ b/tests/python/unittest/test_codegen_makeapi.py
@@ -18,7 +18,7 @@ def test_makeapi():
     stmt = tvm.ir_pass.StorageFlatten(stmt, {A: Ab, B:Bb, C:Cb})
     num_packed_args = 2
     f = tvm.codegen.MakeAPI(stmt, "myadd", [n, Ab, Bb, Cb], num_packed_args)
-    assert(f.handle_data_type[Ab.ptr].dtype == Ab.dtype)
+    assert(f.handle_data_type[Ab.data].dtype == Ab.dtype)
     assert(len(f.args) == 5)
     output_ssa = False
 
diff --git a/tests/python/test_lang_basic.py b/tests/python/unittest/test_lang_basic.py
similarity index 100%
rename from tests/python/test_lang_basic.py
rename to tests/python/unittest/test_lang_basic.py
diff --git a/tests/python/test_lang_buffer.py b/tests/python/unittest/test_lang_buffer.py
similarity index 85%
rename from tests/python/test_lang_buffer.py
rename to tests/python/unittest/test_lang_buffer.py
index b1b6b7d9b8fb..c2a0affc5fcc 100644
--- a/tests/python/test_lang_buffer.py
+++ b/tests/python/unittest/test_lang_buffer.py
@@ -7,7 +7,7 @@ def test_buffer():
     Ab = tvm.Buffer((m, n), tvm.float32)
     Bb = tvm.Buffer((n, l), tvm.float32)
 
-    assert isinstance(Ab, tvm.collections.Buffer)
+    assert isinstance(Ab, tvm.schedule.Buffer)
     assert Ab.dtype == tvm.float32
     assert tuple(Ab.shape) == (m, n)
 
diff --git a/tests/python/test_lang_container.py b/tests/python/unittest/test_lang_container.py
similarity index 100%
rename from tests/python/test_lang_container.py
rename to tests/python/unittest/test_lang_container.py
diff --git a/tests/python/test_lang_schedule.py b/tests/python/unittest/test_lang_schedule.py
similarity index 100%
rename from tests/python/test_lang_schedule.py
rename to tests/python/unittest/test_lang_schedule.py
diff --git a/tests/python/test_lang_tensor.py b/tests/python/unittest/test_lang_tensor.py
similarity index 100%
rename from tests/python/test_lang_tensor.py
rename to tests/python/unittest/test_lang_tensor.py
diff --git a/tests/python/test_pass_basic.py b/tests/python/unittest/test_pass_basic.py
similarity index 100%
rename from tests/python/test_pass_basic.py
rename to tests/python/unittest/test_pass_basic.py
diff --git a/tests/python/test_pass_inline.py b/tests/python/unittest/test_pass_inline.py
similarity index 100%
rename from tests/python/test_pass_inline.py
rename to tests/python/unittest/test_pass_inline.py
diff --git a/tests/python/test_pass_schedule_ops.py b/tests/python/unittest/test_pass_schedule_ops.py
similarity index 100%
rename from tests/python/test_pass_schedule_ops.py
rename to tests/python/unittest/test_pass_schedule_ops.py
diff --git a/tests/python/test_pass_storage_flatten.py b/tests/python/unittest/test_pass_storage_flatten.py
similarity index 100%
rename from tests/python/test_pass_storage_flatten.py
rename to tests/python/unittest/test_pass_storage_flatten.py
diff --git a/tests/python/test_runtime_ndarray.py b/tests/python/unittest/test_runtime_ndarray.py
similarity index 100%
rename from tests/python/test_runtime_ndarray.py
rename to tests/python/unittest/test_runtime_ndarray.py
diff --git a/tests/python/test_runtime_packed_func.py b/tests/python/unittest/test_runtime_packed_func.py
similarity index 100%
rename from tests/python/test_runtime_packed_func.py
rename to tests/python/unittest/test_runtime_packed_func.py
diff --git a/tests/python/test_runtime_stack_vm.py b/tests/python/unittest/test_runtime_stack_vm.py
similarity index 85%
rename from tests/python/test_runtime_stack_vm.py
rename to tests/python/unittest/test_runtime_stack_vm.py
index 435df5faadf2..363473661a3a 100644
--- a/tests/python/test_runtime_stack_vm.py
+++ b/tests/python/unittest/test_runtime_stack_vm.py
@@ -37,8 +37,8 @@ def test_stack_vm_loop():
     stmt = tvm.make.For(
         i, 0, n - 1, 0, 0,
         tvm.make.Block(
-            tvm.make.Store(Ab.ptr,
-                           tvm.make.Load(dtype, Ab.ptr, i) + 1,
+            tvm.make.Store(Ab.data,
+                           tvm.make.Load(dtype, Ab.data, i) + 1,
                            i + 1),
             tvm.make.Evaluate(tvm_call_global("tvm_stack_vm_print", i))))
     print(stmt)
@@ -59,10 +59,10 @@ def test_stack_vm_cond():
         i, 0, n - 1, 0, 0,
         tvm.make.IfThenElse(
             tvm.make.EQ(i, 4),
-            tvm.make.Store(Ab.ptr,
-                           tvm.make.Load(dtype, Ab.ptr, i) + 1, i + 1),
-            tvm.make.Store(Ab.ptr,
-                           tvm.make.Load(dtype, Ab.ptr, i) + 2, i + 1)))
+            tvm.make.Store(Ab.data,
+                           tvm.make.Load(dtype, Ab.data, i) + 1, i + 1),
+            tvm.make.Store(Ab.data,
+                           tvm.make.Load(dtype, Ab.data, i) + 2, i + 1)))
     print(stmt)
     fapi = tvm.codegen.MakeAPI(stmt, "test", [Ab], 1)
     f = tvm.codegen.BuildStackVM(fapi)
diff --git a/tests/python/test_schedule_bound_inference.py b/tests/python/unittest/test_schedule_bound_inference.py
similarity index 100%
rename from tests/python/test_schedule_bound_inference.py
rename to tests/python/unittest/test_schedule_bound_inference.py
diff --git a/tests/travis/run_test.sh b/tests/travis/run_test.sh
index 5c332a5553c3..a64a39ea50fa 100755
--- a/tests/travis/run_test.sh
+++ b/tests/travis/run_test.sh
@@ -38,10 +38,10 @@ fi
 if [ ${TASK} == "python_test" ] || [ ${TASK} == "all_test" ]; then
     make all || exit -1
     if [ ${TRAVIS_OS_NAME} == "osx" ]; then
-        python -m nose -v tests/python/ || exit -1
-        python3 -m nose -v tests/python/ || exit -1
+        python -m nose -v tests/python/unittest || exit -1
+        python3 -m nose -v tests/python/unittest || exit -1
     else
-        nosetests -v tests/python/ || exit -1
-        nosetests3 -v tests/python/ || exit -1
+        nosetests -v tests/python/unittest || exit -1
+        nosetests3 -v tests/python/unittest || exit -1
     fi
 fi