Rename sparse_bucket_generator to generate_vocab (#226)

Also removed dangling references to files that do not exist, and updated
documentation accordingly.

Author: mtrofin

compiler_opt/rl/inlining/config.py

@@ -25,7 +25,6 @@
 @gin.configurable()
 def get_inlining_signature_spec():
   """Returns (time_step_spec, action_spec) for LLVM inlining."""
-  # LINT.IfChange
   observation_spec = dict(
       (key, tf.TensorSpec(dtype=tf.int64, shape=(), name=key)) for key in (
           # Base features
@@ -75,7 +74,6 @@ def get_inlining_signature_spec():
       dtype=tf.int64, shape=(), name='inlining_decision', minimum=0, maximum=1)
 
   return time_step_spec, action_spec
-  # LINT.ThenChange(.../rl/inlining/sparse_bucket_config.pbtxt)
 
 
 @gin.configurable

compiler_opt/rl/regalloc/config.py

@@ -29,7 +29,6 @@ def get_num_registers():
 @gin.configurable()
 def get_regalloc_signature_spec():
   """Returns (time_step_spec, action_spec) for LLVM register allocation."""
-  # LINT.IfChange
   num_registers = get_num_registers()
 
   observation_spec = dict(
@@ -66,7 +65,6 @@ def get_regalloc_signature_spec():
       maximum=num_registers - 1)
 
   return time_step_spec, action_spec
-  # LINT.ThenChange(.../rl/regalloc/sparse_bucket_config.pbtxt)
 
 
 @gin.configurable

compiler_opt/tools/sparse_bucket_generator.py renamed to compiler_opt/tools/generate_vocab.py

@@ -254,14 +254,14 @@ in the trace changes.
 ```shell
 rm -rf $DEFAULT_VOCAB &&
   PYTHONPATH=$PYTHONPATH:. python3 \
-    compiler_opt/tools/sparse_bucket_generator.py \
+    compiler_opt/tools/generate_vocab.py \
     --gin_files=compiler_opt/rl/inlining/gin_configs/common.gin \
     --input=$DEFAULT_TRACE \
     --output_dir=$DEFAULT_VOCAB
 ```
 
 **Note**
-The `sparse_bucket_generator.py` tool optionally accepts two more additional
+The `generate_vocab.py` tool optionally accepts two more additional
 flags `--sampling_fraction` and `--parallelism`.
 `sampling_fraction` downsamples input features and `parallelism` controls the
 degree of parallelism.

docs/inlining-demo/demo.md

@@ -450,7 +450,7 @@ model:
 
 ```bash
 rm -rf ./compiler_opt/rl/regalloc/vocab
-PYTHONPATH=$PYTHONPATH:. python3 compiler_opt/tools/sparse_bucket_generator.py \
+PYTHONPATH=$PYTHONPATH:. python3 compiler_opt/tools/generate_vocab.py \
   --input=$WORKING_DIR/default_trace \
   --output_dir=./compiler_opt/rl/regalloc/vocab \
   --gin_files=compiler_opt/rl/regalloc/gin_configs/common.gin