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package org.nd4j.linalg.util;
import lombok.NonNull;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.nd4j.autodiff.samediff.SameDiff;
import org.nd4j.graph.FlatGraph;
import org.nd4j.linalg.api.buffer.DataType;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.factory.Nd4j;
import org.nd4j.common.validation.Nd4jCommonValidator;
import org.nd4j.common.validation.ValidationResult;
import java.io.*;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.Map;
/**
* A utility for validating multiple file formats that ND4J and SameDiff can read
*
* @author Alex Black
*/
public class Nd4jValidator {
private Nd4jValidator() {
}
/**
* Validate whether the file represents a valid INDArray (of any data type) saved previously with {@link Nd4j#saveBinary(INDArray, File)}
* to be read with {@link Nd4j#readBinary(File)}
*
* @param f File that should represent an INDArray saved with Nd4j.saveBinary
* @return Result of validation
*/
public static ValidationResult validateINDArrayFile(@NonNull File f) {
return validateINDArrayFile(f, (DataType[]) null);
}
/**
* Validate whether the file represents a valid INDArray (of one of the allowed/specified data types) saved previously
* with {@link Nd4j#saveBinary(INDArray, File)} to be read with {@link Nd4j#readBinary(File)}
*
* @param f File that should represent an INDArray saved with Nd4j.saveBinary
* @param allowableDataTypes May be null. If non-null, the file must represent one of the specified data types
* @return Result of validation
*/
public static ValidationResult validateINDArrayFile(@NonNull File f, DataType... allowableDataTypes) {
ValidationResult vr = Nd4jCommonValidator.isValidFile(f, "INDArray File", false);
if (vr != null && !vr.isValid()) {
vr.setFormatClass(INDArray.class);
return vr;
}
//TODO let's do this without reading the whole thing into memory - check header + length...
try (INDArray arr = Nd4j.readBinary(f)) { //Using the fact that INDArray.close() exists -> deallocate memory as soon as reading is done
if (allowableDataTypes != null) {
ArrayUtils.contains(allowableDataTypes, arr.dataType());
}
} catch (IOException e) {
return ValidationResult.builder()
.valid(false)
.formatType("INDArray File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("Unable to read file (IOException)"))
.exception(e)
.build();
} catch (Throwable t) {
if (t instanceof OutOfMemoryError || t.getMessage().toLowerCase().contains("failed to allocate")) {
//This is a memory exception during reading... result is indeterminant (might be valid, might not be, can't tell here)
return ValidationResult.builder()
.valid(true)
.formatType("INDArray File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.build();
}
return ValidationResult.builder()
.valid(false)
.formatType("INDArray File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt or is not a binary INDArray file"))
.exception(t)
.build();
}
return ValidationResult.builder()
.valid(true)
.formatType("INDArray File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.build();
}
/**
* Validate whether the file represents a valid INDArray text file (of any data type) saved previously with
* {@link Nd4j#writeTxt(INDArray, String)} to be read with {@link Nd4j#readTxt(String)} }
*
* @param f File that should represent an INDArray saved with Nd4j.writeTxt
* @return Result of validation
*/
public static ValidationResult validateINDArrayTextFile(@NonNull File f) {
ValidationResult vr = Nd4jCommonValidator.isValidFile(f, "INDArray Text File", false);
if (vr != null && !vr.isValid()) {
vr.setFormatClass(INDArray.class);
return vr;
}
//TODO let's do this without reading the whole thing into memory - check header + length...
try (INDArray arr = Nd4j.readTxt(f.getPath())) { //Using the fact that INDArray.close() exists -> deallocate memory as soon as reading is done
System.out.println();
} catch (Throwable t) {
if (t instanceof OutOfMemoryError || t.getMessage().toLowerCase().contains("failed to allocate")) {
//This is a memory exception during reading... result is indeterminant (might be valid, might not be, can't tell here)
return ValidationResult.builder()
.valid(true)
.formatType("INDArray Text File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.build();
}
return ValidationResult.builder()
.valid(false)
.formatType("INDArray Text File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt or is not a text INDArray file"))
.exception(t)
.build();
}
return ValidationResult.builder()
.valid(true)
.formatType("INDArray Text File")
.formatClass(INDArray.class)
.path(Nd4jCommonValidator.getPath(f))
.build();
}
/**
* Validate whether the file represents a valid Numpy .npy file to be read with {@link Nd4j#createFromNpyFile(File)} }
*
* @param f File that should represent a Numpy .npy file written with Numpy save method
* @return Result of validation
*/
public static ValidationResult validateNpyFile(@NonNull File f) {
ValidationResult vr = Nd4jCommonValidator.isValidFile(f, "Numpy .npy File", false);
if (vr != null && !vr.isValid())
return vr;
//TODO let's do this without reading whole thing into memory
try (INDArray arr = Nd4j.createFromNpyFile(f)) { //Using the fact that INDArray.close() exists -> deallocate memory as soon as reading is done
} catch (Throwable t) {
if (t instanceof OutOfMemoryError || t.getMessage().toLowerCase().contains("failed to allocate")) {
//This is a memory exception during reading... result is indeterminant (might be valid, might not be, can't tell here)
return ValidationResult.builder()
.valid(true)
.formatType("Numpy .npy File")
.path(Nd4jCommonValidator.getPath(f))
.build();
}
return ValidationResult.builder()
.valid(false)
.formatType("Numpy .npy File")
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt or is not a Numpy .npy file"))
.exception(t)
.build();
}
return ValidationResult.builder()
.valid(true)
.formatType("Numpy .npy File")
.path(Nd4jCommonValidator.getPath(f))
.build();
}
/**
* Validate whether the file represents a valid Numpy .npz file to be read with {@link Nd4j#createFromNpyFile(File)} }
*
* @param f File that should represent a Numpy .npz file written with Numpy savez method
* @return Result of validation
*/
public static ValidationResult validateNpzFile(@NonNull File f) {
ValidationResult vr = Nd4jCommonValidator.isValidFile(f, "Numpy .npz File", false);
if (vr != null && !vr.isValid())
return vr;
Map m = null;
try {
m = Nd4j.createFromNpzFile(f);
} catch (Throwable t) {
return ValidationResult.builder()
.valid(false)
.formatType("Numpy .npz File")
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt or is not a Numpy .npz file"))
.exception(t)
.build();
} finally {
//Deallocate immediately
if (m != null) {
for (INDArray arr : m.values()) {
if (arr != null) {
arr.close();
}
}
}
}
return ValidationResult.builder()
.valid(true)
.formatType("Numpy .npz File")
.path(Nd4jCommonValidator.getPath(f))
.build();
}
/**
* Validate whether the file represents a valid Numpy text file (written using numpy.savetxt) to be read with
* {@link Nd4j#readNumpy(String)} }
*
* @param f File that should represent a Numpy text file written with Numpy savetxt method
* @return Result of validation
*/
public static ValidationResult validateNumpyTxtFile(@NonNull File f, @NonNull String delimiter, @NonNull Charset charset) {
ValidationResult vr = Nd4jCommonValidator.isValidFile(f, "Numpy text file", false);
if (vr != null && !vr.isValid())
return vr;
String s;
try {
s = FileUtils.readFileToString(f, charset);
} catch (Throwable t) {
return ValidationResult.builder()
.valid(false)
.formatType("Numpy text file")
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt or is not a Numpy text file"))
.exception(t)
.build();
}
String[] lines = s.split("\n");
int countPerLine = 0;
for (int i = 0; i < lines.length; i++) {
String[] lineSplit = lines[i].split(delimiter);
if (i == 0) {
countPerLine = lineSplit.length;
} else if (!lines[i].isEmpty()) {
if (countPerLine != lineSplit.length) {
return ValidationResult.builder()
.valid(false)
.formatType("Numpy text file")
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("Number of values in each line is not the same for all lines: File may be corrupt, is not a Numpy text file, or delimiter \"" + delimiter + "\" is incorrect"))
.build();
}
}
for (int j = 0; j < lineSplit.length; j++) {
try {
Double.parseDouble(lineSplit[j]);
} catch (NumberFormatException e) {
return ValidationResult.builder()
.valid(false)
.formatType("Numpy text file")
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt, is not a Numpy text file, or delimiter \"" + delimiter + "\" is incorrect"))
.exception(e)
.build();
}
}
}
return ValidationResult.builder()
.valid(true)
.formatType("Numpy text file")
.path(Nd4jCommonValidator.getPath(f))
.build();
}
/**
* Validate whether the file represents a valid SameDiff FlatBuffers file, previously saved with {@link org.nd4j.autodiff.samediff.SameDiff#asFlatFile(File)} )
* to be read with {@link org.nd4j.autodiff.samediff.SameDiff#fromFlatFile(File)} }
*
* @param f File that should represent a SameDiff FlatBuffers file
* @return Result of validation
*/
public static ValidationResult validateSameDiffFlatBuffers(@NonNull File f) {
ValidationResult vr = Nd4jCommonValidator.isValidFile(f, "SameDiff FlatBuffers file", false);
if (vr != null && !vr.isValid())
return vr;
try {
byte[] bytes;
try (InputStream is = new BufferedInputStream(new FileInputStream(f))) {
bytes = IOUtils.toByteArray(is);
}
ByteBuffer bbIn = ByteBuffer.wrap(bytes);
FlatGraph fg = FlatGraph.getRootAsFlatGraph(bbIn);
int vl = fg.variablesLength();
int ol = fg.nodesLength();
System.out.println();
} catch (Throwable t) {
return ValidationResult.builder()
.valid(false)
.formatType("SameDiff FlatBuffers file")
.formatClass(SameDiff.class)
.path(Nd4jCommonValidator.getPath(f))
.issues(Collections.singletonList("File may be corrupt or is not a SameDiff file in FlatBuffers format"))
.exception(t)
.build();
}
return ValidationResult.builder()
.valid(true)
.formatType("SameDiff FlatBuffers file")
.formatClass(SameDiff.class)
.path(Nd4jCommonValidator.getPath(f))
.build();
}
}
