Re-enable learning_hybrid_frontend_through_example_tutorial.py (#377)

Author: yf225

.jenkins/build.sh

@@ -51,9 +51,6 @@ pushd audio
 python setup.py install
 popd
 
-# We will fix the hybrid frontend tutorials when the API is stable
-rm beginner_source/hybrid_frontend/learning_hybrid_frontend_through_example_tutorial.py || true
-
 aws configure set default.s3.multipart_threshold 5120MB
 
 # Decide whether to parallelize tutorial builds, based on $JOB_BASE_NAME

beginner_source/hybrid_frontend/learning_hybrid_frontend_through_example_tutorial.py

@@ -92,21 +92,21 @@ class definitions.
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 We can implement part one as a pure python function as below. Notice, to
-trace this function we add the ``@torch.jit.trace`` decorator. Since the
-trace requires a dummy input of the expected runtime type and shape, we
-also include the ``torch.rand`` to generate a single valued torch
-tensor.
+trace this function we call ``torch.jit.trace`` and pass in the function
+to be traced. Since the trace requires a dummy input of the expected
+runtime type and shape, we also include the ``torch.rand`` to generate a
+single valued torch tensor.
 
 """
 
 import torch
 
-# This is how you define a traced function
-# Pass in an example input to this decorator and then apply it to the function
-@torch.jit.trace(torch.rand(()))
-def traced_fn(x):
+def fn(x):
     return torch.abs(2*x)
 
+# This is how you define a traced function
+# Pass in both the function to be traced and an example input to ``torch.jit.trace``
+traced_fn = torch.jit.trace(fn, torch.rand(()))
 
 ######################################################################
 # Part 2 - Scripting a pure python function
@@ -124,7 +124,7 @@ def traced_fn(x):
 @torch.jit.script
 def script_fn(x):
     z = torch.ones([1], dtype=torch.int64)
-    for i in range(x):
+    for i in range(int(x)):
         z = z * (i + 1)
     return z
 
@@ -163,7 +163,7 @@ class ScriptModule(torch.jit.ScriptModule):
     @torch.jit.script_method
     def forward(self, x):
         r = -x
-        if torch.fmod(x, 2.0) == 0.0:
+        if int(torch.fmod(x, 2.0)) == 0.0:
             r = x / 2.0
         return r
 
@@ -201,7 +201,7 @@ def __init__(self):
         # Modules must be attributes on the Module because if you want to trace
         # or script this Module, we must be able to inherit the submodules'
         # params.
-        self.traced_module = torch.jit.trace(torch.rand(()))(TracedModule())
+        self.traced_module = torch.jit.trace(TracedModule(), torch.rand(()))
         self.script_module = ScriptModule()
 
         print('traced_fn graph', traced_fn.graph)
@@ -244,8 +244,6 @@ def forward(self, x):
 # Tracing the Top-Level Model
 # ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 #
-# **NOTE:** Open issue https://github.com/pytorch/pytorch/issues/8755
-#
 # The last part of the example is to trace the top-level module, ``Net``.
 # As mentioned previously, since the traced/scripted modules are
 # attributes of Net, we are able to trace ``Net`` as it inherits the
@@ -254,11 +252,9 @@ def forward(self, x):
 # Also, check out the graph that is created.
 #
 
-# TODO: this fails with some weird bug https://github.com/pytorch/pytorch/issues/8755
-#n_traced = torch.jit.trace(torch.tensor([5]))(n)
-#print(n_traced(torch.tensor([5])))
-
-# TODO: print the graph of the traced module
+n_traced = torch.jit.trace(n, torch.tensor([5]))
+print(n_traced(torch.tensor([5])))
+print('n_traced graph', n_traced.graph)
 
 
 ######################################################################