Function show

utils/array_utils.hpp:44–105

 */
template <typename numtype>
std::string show(const numtype *a, size_t rows, size_t cols,
                 const std::string &name = "") {
  std::string output = "\n";
  if (name != "") {
    output += "\n" + name + " (" + std::to_string(rows) + ", " +
              std::to_string(cols) + ")\n\n";
  } else {
    output +=
        "\n(" + std::to_string(rows) + ", " + std::to_string(cols) + ")\n\n";
  }
  // spacing as log10 of max value
  int spacing = 1;
  if constexpr (std::is_same<numtype, int>::value) {
    int max = *std::max_element(a, a + rows * cols);
    spacing = std::max(0, (int)log10(max + .01)) + 2;
  } else if constexpr (std::is_same<numtype, float>::value) {
    // spacing = std::max(0, (int)log10(max + .01)) + 1;
    spacing = 8; // scientific notation
  } else if constexpr (std::is_same<numtype, half>::value) {
    spacing = 8;
  } else {
    throw std::runtime_error("Unsupported number type for show()");
  }
  // print to stdout line break for each row
  for (size_t i = 0; i < rows; i++) {
    if (i == kShowMaxRows / 2 && rows > kShowMaxRows) {
      output += "...\n";
      i = rows - kShowMaxRows / 2;
    }
    for (size_t j = 0; j < cols; j++) {
      if (j == kShowMaxCols / 2 && cols > kShowMaxCols) {
        output += " ..";
        j = cols - kShowMaxCols / 2;
      }
      char buffer[50];
      if constexpr (std::is_same<numtype, int>::value) {
        snprintf(buffer, spacing, "%*d", spacing, a[i * cols + j]);
      } else if constexpr (std::is_same<numtype, float>::value) {
        if (std::abs(a[i * cols + j]) < 1000 &&
                std::abs(a[i * cols + j]) > 0.01 ||
            a[i * cols + j] == 0.0) {
          snprintf(buffer, 16, "%9.2f", a[i * cols + j]);
        } else
          snprintf(buffer, 16, "%10.2e", a[i * cols + j]);
      } else if constexpr (std::is_same<numtype, half>::value) {
	float tmp = halfToFloat(a[i * cols + j]);
        if (std::abs(tmp) < 1000 &&
                std::abs(tmp) > 0.01 ||
            tmp == 0.0) {
          snprintf(buffer, 16, "%9.2f", tmp);
        } else
          snprintf(buffer, 16, "%10.2e", tmp);
      } else {
        throw std::runtime_error("Unsupported number type for show()");
      }
      output += buffer;
    }
    output += "\n";