Ask questionsTFLite: C++/Java: experimental kernel ctc_beam_search_decoder returns always buffer length=length+1

System information

  • OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 20.04
  • Mobile device (e.g. iPhone 8, Pixel 2, Samsung Galaxy) if the issue happens on mobile device: Pixel 2
  • TensorFlow installed from (source or binary): source
  • TensorFlow version: master
  • Python version: 3.8
  • Installed using virtualenv? pip? conda?: pip
  • Bazel version (if compiling from source): 3.1.0
  • GCC/Compiler version (if compiling from source): 9.3.0
  • CUDA/cuDNN version: -
  • GPU model and memory: -
  • NDK: android-ndk-r20

Describe the current behavior All returned Java IntBuffer (TFLite Android) from the concrete function ( decoder.tflite) have an extra added byte=0 in the end of the returned dense_decoded, e.g. [11,11,4,7,8,0]. => This happens only in TFLite with the tflite experimental kernel returned from Java.

Describe the expected behavior The returned dense_decoded from the concrete function ( decoder.tflite) should be e.g. [11,11,4,7,8]. => If I use the concrete function directly in python it works as expected => If I use the concrete function exported as decoder.tflite and loaded directly in python it works as expected.

Standalone code to reproduce the issue

git clone
cd tensorflow
git checkout -b master 6e9d916229b5aefbdcfd33cbc4b34c9f48b5e6e1
nano .tf_configure.bazelrc

Bazel config .tf_configure.bazelrc:

build --action_env PYTHON_BIN_PATH="/usr/bin/python"
build --action_env PYTHON_LIB_PATH="/usr/lib/python3/dist-packages"
build --python_path="/usr/bin/python"
build:xla --define with_xla_support=true
build:opt --copt=-march=native
build:opt --copt=-Wno-sign-compare
build:opt --host_copt=-march=native
build:opt --define with_default_optimizations=true
build --action_env ANDROID_NDK_API_LEVEL="21"
build --action_env ANDROID_BUILD_TOOLS_VERSION="28.0.0"
build --action_env ANDROID_SDK_API_LEVEL="23"
test --flaky_test_attempts=3
test --test_size_filters=small,medium
test --test_tag_filters=-benchmark-test,-no_oss,-oss_serial
test --build_tag_filters=-benchmark-test,-no_oss
test --test_tag_filters=-gpu
test --build_tag_filters=-gpu
build --action_env TF_CONFIGURE_IOS="0"

And compile with

bazel build --cxxopt='--std=c++14' -c opt --fat_apk_cpu=arm64-v8a,armeabi-v7a --config=monolithic \
  --host_crosstool_top=@bazel_tools//tools/cpp:toolchain \
  //tensorflow/lite/java:tensorflow-lite \
  //tensorflow/lite/java:tensorflow-lite-gpu \
  //tensorflow/lite/delegates/flex:delegate \
  //tensorflow/lite/experimental/kernels:ctc_beam_search_decoder_op \

Concrete function exported to decoder.tflite:

def decode(logits, top_paths=3, beam_width=3):
    batch_size_current, timesteps, _ = tf.shape(input=logits)
    seq_len = tf.fill([batch_size_current], timesteps)
    logits = tf.transpose(a=logits, perm=(1, 0, 2))

    decoded, log_probabilities = tf.nn.ctc_beam_search_decoder(inputs=logits, top_paths=top_paths, beam_width=beam_width, sequence_length=seq_len)

    dense_decoded = tf.sparse.to_dense(decoded[0], default_value=-1)

Answer questions renjie-liu

Thanks a lot for the debug!


why there are three outputs in java? shouldn't it be one output?


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