Fix some typo errors in license header (apache#5956)

Signed-off-by: leonwanghui <wanghui71leon@gmail.com>

python/tvm/relay/backend/vm.py

@@ -1,4 +1,4 @@
-# License .to the Apache Software Foundation (ASF) under one
+# Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
 # distributed with this work for additional information
 # regarding copyright ownership.  The ASF licenses this file
@@ -73,6 +73,7 @@ def compile(mod, target=None, target_host=None, params=None):
 
 class VMCompiler(object):
     """Compiler that compiles Relay module to VM executable."""
+
     def __init__(self):
         self.mod = _vm._VMCompiler()
         self._lower = self.mod["lower"]
@@ -239,6 +240,7 @@ class VMExecutor(Executor):
     target : :py:class:`Target`
         The target option to build the function.
     """
+
     def __init__(self, mod, ctx, target):
         if mod is None:
             raise RuntimeError("Must provide module to get VM executor.")

python/tvm/runtime/profiler_vm.py

@@ -1,4 +1,4 @@
-# License .to the Apache Software Foundation (ASF) under one
+# Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
 # distributed with this work for additional information
 # regarding copyright ownership.  The ASF licenses this file
@@ -23,12 +23,15 @@
 from tvm.runtime import _ffi_api
 from . import vm
 
+
 def enabled():
     """Whether vm profiler is enabled."""
     return hasattr(_ffi_api, "_VirtualMachineDebug")
 
+
 class VirtualMachineProfiler(vm.VirtualMachine):
     """Relay profile VM runtime."""
+
     def __init__(self, mod):
         super(VirtualMachineProfiler, self).__init__(mod)
         m = mod.module if isinstance(mod, vm.Executable) else mod

python/tvm/runtime/vm.py

@@ -1,4 +1,4 @@
-# License .to the Apache Software Foundation (ASF) under one
+# Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file
 # distributed with this work for additional information
 # regarding copyright ownership.  The ASF licenses this file
@@ -28,6 +28,7 @@
 from .object import Object
 from . import _ffi_api, container
 
+
 def _convert(arg, cargs):
     if isinstance(arg, Object):
         cargs.append(arg)
@@ -59,6 +60,7 @@ def convert(args):
 
 class Executable(object):
     """Relay VM executable"""
+
     def __init__(self, mod):
         self.mod = mod
         self._function_params = {}
@@ -272,6 +274,7 @@ def get_function_params(self, func_name):
 
 class VirtualMachine(object):
     """Relay VM runtime."""
+
     def __init__(self, mod):
         if not isinstance(mod, (Executable, tvm.runtime.Module)):
             raise TypeError("mod is expected to be the type of Executable or " +