def encode(self, uncompressed):
"""perform compression
params:
uncompressed: np.ndarray - the data to be compressed
"""
uncompressed_lp = None
compressed_lp = None
try:
uncompressed_lp = pressio.io_data_from_numpy(uncompressed)
compressed_lp = pressio.data_new_empty(pressio.byte_dtype,
pressio.vector_uint64_t())
rc = pressio.compressor_compress(self._compressor, uncompressed_lp,
compressed_lp)
if rc:
raise PressioException.from_compressor(self._compressor)
comp = pressio.io_data_to_bytes(compressed_lp)
finally:
pressio.data_free(uncompressed_lp)
pressio.data_free(compressed_lp)
return comp
sz_options = pressio.compressor_get_options(compressor)
metric_ids = pressio.vector_string([b'time', b'size'])
metrics = pressio.new_metrics(library, metric_ids)
pressio.options_set_integer(sz_options, b"sz:error_bound_mode", sz.PSNR)
pressio.options_set_double(sz_options, b"sz:psnr_err_bound",
float(sys.argv[1]))
pressio.compressor_check_options(compressor, sz_options)
pressio.compressor_set_options(compressor, sz_options)
pressio.compressor_set_metrics(compressor, metrics)
input_data = pressio.io_data_from_numpy(floatArray)
compressed_data = pressio.data_new_empty(pressio.byte_dtype,
pressio.vector_uint64_t())
dims = pressio.vector_uint64_t([height, width, 3])
decompressed_data = pressio.data_new_empty(pressio.double_dtype, dims)
#compress data with selected compressor
pressio.compressor_compress(compressor, input_data, compressed_data)
#decompress data with selected compressor
pressio.compressor_decompress(compressor, compressed_data,
decompressed_data)
#get metric results for compression
metric_results = pressio.compressor_get_metrics_results(compressor)
#Grab relevant compression metrics
compression_ratio = pressio.new_double()
metrics_ids = pressio.vector_string([b'time', b'size'])
metrics = pressio.new_metrics(library, metrics_ids)
pressio.options_set_integer(sz_options, b"sz:error_bound_mode", sz.ABS)
pressio.options_set_double(sz_options, b"sz:abs_err_bound", 0.5)
pressio.compressor_check_options(compressor, sz_options)
pressio.compressor_set_options(compressor, sz_options)
pressio.compressor_set_metrics(compressor, metrics)
data = np.random.rand(300, 300, 300)
input_data = pressio.io_data_from_numpy(data)
compressed_data = pressio.data_new_empty(pressio.byte_dtype,
pressio.vector_uint64_t())
dims = pressio.vector_uint64_t([300, 300, 300])
decompressed_data = pressio.data_new_empty(pressio.double_dtype, dims)
pressio.compressor_compress(compressor, input_data, compressed_data)
pressio.compressor_decompress(compressor, compressed_data, decompressed_data)
metric_results = pressio.compressor_get_metrics_results(compressor)
compression_ratio = pressio.new_double()
pressio.options_get_double(metric_results, b"size:compression_ratio",
compression_ratio)
print("compression ratio", pressio.double_value(compression_ratio))
result = pressio.io_data_to_numpy(decompressed_data)
