1 files changed, 199 insertions, 0 deletions
diff --git a/tests/use_case/asr/Wav2LetterPostprocessingTest.cc b/tests/use_case/asr/Wav2LetterPostprocessingTest.cc
new file mode 100644
index 0000000..9ed2e1b
--- /dev/null
+++ b/tests/use_case/asr/Wav2LetterPostprocessingTest.cc
@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 2021 Arm Limited. All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "Wav2LetterPostprocess.hpp"
+#include "Wav2LetterModel.hpp"
+
+#include <algorithm>
+#include <catch.hpp>
+#include <limits>
+
+template <typename T>
+static TfLiteTensor GetTestTensor(
+                        std::vector <int>&      shape,
+                        T                       initVal,
+                        std::vector<T>&         vectorBuf)
+{
+    REQUIRE(0 != shape.size());
+
+    shape.insert(shape.begin(), shape.size());
+    uint32_t sizeInBytes = sizeof(T);
+    for (size_t i = 1; i < shape.size(); ++i) {
+        sizeInBytes *= shape[i];
+    }
+
+    /* Allocate mem. */
+    vectorBuf = std::vector<T>(sizeInBytes, initVal);
+    TfLiteIntArray* dims = tflite::testing::IntArrayFromInts(shape.data());
+    return tflite::testing::CreateQuantizedTensor(
+                                vectorBuf.data(), dims,
+                                1, 0, "test-tensor");
+}
+
+TEST_CASE("Checking return value")
+{
+    SECTION("Mismatched post processing parameters and tensor size")
+    {
+        const uint32_t ctxLen = 5;
+        const uint32_t innerLen = 3;
+        arm::app::audio::asr::Postprocess post{ctxLen, innerLen, 0};
+
+        std::vector <int> tensorShape = {1, 1, 1, 13};
+        std::vector <int8_t> tensorVec;
+        TfLiteTensor tensor = GetTestTensor<int8_t>(
+                                tensorShape, 100, tensorVec);
+        REQUIRE(false == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, false));
+    }
+
+    SECTION("Post processing succeeds")
+    {
+        const uint32_t ctxLen = 5;
+        const uint32_t innerLen = 3;
+        arm::app::audio::asr::Postprocess post{ctxLen, innerLen, 0};
+
+        std::vector <int> tensorShape = {1, 1, 13, 1};
+        std::vector <int8_t> tensorVec;
+        TfLiteTensor tensor = GetTestTensor<int8_t>(
+                                tensorShape, 100, tensorVec);
+
+        /* Copy elements to compare later. */
+        std::vector <int8_t> originalVec = tensorVec;
+
+        /* This step should not erase anything. */
+        REQUIRE(true == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, false));
+    }
+}
+
+
+TEST_CASE("Postprocessing - erasing required elements")
+{
+    constexpr uint32_t ctxLen = 5;
+    constexpr uint32_t innerLen = 3;
+    constexpr uint32_t nRows = 2*ctxLen + innerLen;
+    constexpr uint32_t nCols = 10;
+    constexpr uint32_t blankTokenIdx = nCols - 1;
+    std::vector <int> tensorShape = {1, 1, nRows, nCols};
+
+    SECTION("First and last iteration")
+    {
+        arm::app::audio::asr::Postprocess post{ctxLen, innerLen, blankTokenIdx};
+
+        std::vector <int8_t> tensorVec;
+        TfLiteTensor tensor = GetTestTensor<int8_t>(
+                                tensorShape, 100, tensorVec);
+
+        /* Copy elements to compare later. */
+        std::vector <int8_t> originalVec = tensorVec;
+
+        /* This step should not erase anything. */
+        REQUIRE(true == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, true));
+        REQUIRE(originalVec == tensorVec);
+    }
+
+    SECTION("Right context erase")
+    {
+        arm::app::audio::asr::Postprocess post{ctxLen, innerLen, blankTokenIdx};
+
+        std::vector <int8_t> tensorVec;
+        TfLiteTensor tensor = GetTestTensor<int8_t>(
+                                tensorShape, 100, tensorVec);
+
+        /* Copy elements to compare later. */
+        std::vector <int8_t> originalVec = tensorVec;
+
+        /* This step should erase the right context only. */
+        REQUIRE(true == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, false));
+        REQUIRE(originalVec != tensorVec);
+
+        /* The last ctxLen * 10 elements should be gone. */
+        for (size_t i = 0; i < ctxLen; ++i) {
+            for (size_t j = 0; j < nCols; ++j) {
+                /* Check right context elements are zeroed. */
+                if (j == blankTokenIdx) {
+                    CHECK(tensorVec[(ctxLen + innerLen) * nCols + i*nCols + j] == 1);
+                } else {
+                    CHECK(tensorVec[(ctxLen + innerLen) * nCols + i*nCols + j] == 0);
+                }
+
+                /* Check left context is preserved. */
+                CHECK(tensorVec[i*nCols + j] == originalVec[i*nCols + j]);
+            }
+        }
+
+        /* Check inner elements are preserved. */
+        for (size_t i = ctxLen * nCols; i < (ctxLen + innerLen) * nCols; ++i) {
+            CHECK(tensorVec[i] == originalVec[i]);
+        }
+    }
+
+    SECTION("Left and right context erase")
+    {
+        arm::app::audio::asr::Postprocess post{ctxLen, innerLen, blankTokenIdx};
+
+        std::vector <int8_t> tensorVec;
+        TfLiteTensor tensor = GetTestTensor<int8_t>(
+                                tensorShape, 100, tensorVec);
+
+        /* Copy elements to compare later. */
+        std::vector <int8_t> originalVec = tensorVec;
+
+        /* This step should erase right context. */
+        REQUIRE(true == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, false));
+
+        /* Calling it the second time should erase the left context. */
+        REQUIRE(true == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, false));
+
+        REQUIRE(originalVec != tensorVec);
+
+        /* The first and last ctxLen * 10 elements should be gone. */
+        for (size_t i = 0; i < ctxLen; ++i) {
+            for (size_t j = 0; j < nCols; ++j) {
+                /* Check left and right context elements are zeroed. */
+                if (j == blankTokenIdx) {
+                    CHECK(tensorVec[(ctxLen + innerLen) * nCols + i*nCols + j] == 1);
+                    CHECK(tensorVec[i*nCols + j] == 1);
+                } else {
+                    CHECK(tensorVec[(ctxLen + innerLen) * nCols + i*nCols + j] == 0);
+                    CHECK(tensorVec[i*nCols + j] == 0);
+                }
+            }
+        }
+
+        /* Check inner elements are preserved. */
+        for (size_t i = ctxLen * nCols; i < (ctxLen + innerLen) * nCols; ++i) {
+            /* Check left context is preserved. */
+            CHECK(tensorVec[i] == originalVec[i]);
+        }
+    }
+
+    SECTION("Try left context erase")
+    {
+        /* Should not be able to erase the left context if it is the first iteration. */
+        arm::app::audio::asr::Postprocess post{ctxLen, innerLen, blankTokenIdx};
+
+        std::vector <int8_t> tensorVec;
+        TfLiteTensor tensor = GetTestTensor<int8_t>(
+                                tensorShape, 100, tensorVec);
+
+        /* Copy elements to compare later. */
+        std::vector <int8_t> originalVec = tensorVec;
+
+        /* Calling it the second time should erase the left context. */
+        REQUIRE(true == post.Invoke(&tensor, arm::app::Wav2LetterModel::ms_outputRowsIdx, true));
+
+        REQUIRE(originalVec == tensorVec);
+    }
+}