* fixed scratch buffer extern decleration in ceva_common.h

* Add optimized depthwise conv BX1 and SP500

* fixed year in copyright notice
Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

- Save ~4KB of RAM by implementing a lightweight version of the vector, which only accesses integer values, without implicit conversion.
- Change Micro kernels to access flexbuffers as vectors instead of maps, which is recommended by the flexbuffers doc for efficiency. Since the values in the vector are ordered alphabetically by their keys, the kernels can access them by index instead.
- Revert detection_postprocess to the native flexbuffers API. The
LiteVector API doesn't support IsNull() and I prefer not to support two
custom flexbuffer APIs.
Co-authored-by: NNat Jeffries <natmjeffries@gmail.com>

BUG=http://b/192614484

* Remove MICROLITE_CC_KERNELS_SRCS from the MICROLITE_CC_SRCS list.

Stop the kernel sources from being compiled into both the core
objects and kernel objects.

* Add kernel sources to list_library_sources

* Fix project generation presubmit
Co-authored-by: NNat Jeffries <natmjeffries@gmail.com>

Change-Id: I23e7425445fd8fdb37be0ebb43cb9c8529ceb368
Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

Previously, some sources were built before THIRD_PARTY_TARGETS was downloaded, meaning dependencies in those sources on flatbuffers, gemmlowp, etc could be missed. An alternative to this "dependency for every source" approach could be to add $(THIRD_PARTY_TARGETS) as the first dependency in $(MICROLITE_LIB_PATH), but this relies on Make dependency ordering which is ill-advised

Background: https://stackoverflow.com/questions/9159960/order-of-processing-components-in-makefile

Lots of large models have >50 ops, so upping the max number to 1024 seems reasonable. Most TFLM models should not exceed 1024 ops.

Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

Verified that the following commands work:
```
make -f tensorflow/lite/micro/tools/make/Makefile TARGET=hexagon OPTIMIZED_KERNEL_DIR=hexagon OPTIMIZED_KERNEL_DIR_PREFIX=third_party HEXAGON_TFLM_LIB=~/Qualcomm/tflm_google/hexagon_tflm_core.a test_kernel_fully_connected_test
make -f tensorflow/lite/micro/tools/make/Makefile TARGET=hexagon OPTIMIZED_KERNEL_DIR=hexagon OPTIMIZED_KERNEL_DIR_PREFIX=third_party HEXAGON_TFLM_LIB=~/Qualcomm/tflm_google/hexagon_tflm_core.a test_kernel_svdf_test
make -f tensorflow/lite/micro/tools/make/Makefile TARGET=hexagon OPTIMIZED_KERNEL_DIR=hexagon OPTIMIZED_KERNEL_DIR_PREFIX=third_party HEXAGON_TFLM_LIB=~/Qualcomm/tflm_google/hexagon_tflm_core.a run_keyword_benchmark
```

BUG=http://b/174781826

The TFLM Makefile itself ensures that OPTIMIZED_KERNEL_DIR is a valid
path. However, for some special cases (such as http://cl/379964344), we
would like to allow the specialization to gracefully handle a directory
that does not exist in the tree.

BUG=see use-case from http://cl/379964344

- Add external lib references to Hexagon FFT functions

Add support for 8x16 kernels in TFLM.

Support 16-bit activations and 8-bit weights for a subset of the TFLM kernels.

BUG=http://b/184839019

* Fix the Vision P6 build.

Tested the following command:
```
make -f tensorflow/lite/micro/tools/make/Makefile TARGET=xtensa OPTIMIZED_KERNEL_DIR=xtensa TARGET_ARCH=vision_p6 XTENSA_CORE=P6_200528 build -j8
```

* Fix the Fusion F1 build.

* check PR description for a BUG= line

* Changed file name and added some more documentation.

* move the if to be on the steo instead of at the job.

This is to allow for the job to succeed (instead of being skipped) when
the BUG= text is found. And as a result we can have it be a required
status check.
Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>
Co-authored-by: NAdvait Jain <advaitjain@google.com>

* share code with the cmsis implementation
 * groundwork needed to add in Xtensa implementation

BUG=https://github.com/tensorflow/tflite-micro/issues/205

* Remove lite-specific code from copy of SPACE_TO_DEPTH

Remove the bulk of lite-specific code from the micro
implementation of operator SPACE_TO_DEPTH.

-  Flatten namespace
-  Don't resize output tensors
-  Remove type other than int8 and float32
-  Don't use gtest

* Port operator SPACE_TO_DEPTH from lite

Port the SPACE_TO_DEPTH operator from lite to micro. Add the
operator and test to the build.
Co-authored-by: NPete Warden <pete@petewarden.com>

* Update ethosu driver entrypoint

* Update copyright notice
Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

Overrides core optimization level from -Os to -O2.

* Remove hifimini support from the bazel build.

 * Consolidate all kernel BUILD targets into micro_ops
 * remove select statements for xtensa_hifimini

BUG=http://b/191406930

* fix bazel build.

* Explicitly build all targets with bazel as part of CI.

With #194 we removed the build_test targets. We are instead going to
explicitly have a bazel build command as part of the CI checks.

* fix typo

* Put location variables before target .inc's are included

They can be useful in the target .inc

Change-Id: I0ee3f77f79be272f4dc3502fb4a38017d8162fa1

* Add ARMC6 compiler support for Corstone-300 target

  * Use fromelf instead of objcopy for armclang toolchain when
    generating a binary
  * Add ARMC6 linker and build flags to the Corstone-330 target
  * Add RETARGET macro in patch script to avoid undefined symbol
    build error for ARMC6.
  * Use a reduced set of Cortex-M CPU's for easier maintenance.

Change-Id: Id9a20d57fa4fa0f1339f44523417e2dabfe7e152

* Review comment - Override exit symbol only for GCC

Change-Id: I93628c92ee352f36c7e7dd99351e4a73c29a8d30

* Review comment - Change how to pass linker options for ARMC6

Change-Id: Iacec5a6df6902bc8a14f460d63ae917039f982cc

* Review comment - correct the upmerge

Change-Id: I9a250f6a444336f9b95428a126a94a18f40060dc
Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

Since the CI builds all the targets (binary and test), and the source of
truth for all the TFLM code is having a build_test is not adding any additional value.

Additionally, a build_test seems to add additional downloads which would
make it slower to run the bazel CI from within a docker container.

Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>

* TFLM refactor out of github.com/tensorflow is mostly complete.
 * The repo-level readme in the current repository is the starting point
   for anyone looking at this repo.

This is the OSS counterpart for http://cl/379367435

BUG=http://b/191077991

Similar to https://github.com/actions/checkout/issues/518

Co-authored-by: NAdvait Jain <advaitjain@users.noreply.github.com>