Revert "Renamed fromMap to fromPairs"

This reverts commit fed5186.

src/SparseVector.php

@@ -32,13 +32,13 @@ public static function fromDense($value)
         return new SparseVector($dimensions, $indices, $values);
     }
 
-    public static function fromPairs($pairs, $dimensions)
+    public static function fromMap($map, $dimensions)
     {
-        // safe to update in-place since $pairs parameter is not a reference
-        ksort($pairs);
+        // okay to update in-place since parameter is not a reference
+        ksort($map);
         $indices = [];
         $values = [];
-        foreach ($pairs as $i => $v) {
+        foreach ($map as $i => $v) {
             if ($v != 0) {
                 $indices[] = intval($i);
                 $values[] = floatval($v);

tests/SparseVectorTest.php

@@ -14,13 +14,13 @@ public function testFromDense()
         $this->assertEquals([1, 2, 3], $embedding->values());
     }
 
-    public function testFromPairs()
+    public function testFromMap()
     {
-        $pairs = [2 => 2, 4 => 3, 0 => 1, 3 => 0];
-        $embedding = SparseVector::fromPairs($pairs, 6);
+        $map = [2 => 2, 4 => 3, 0 => 1, 3 => 0];
+        $embedding = SparseVector::fromMap($map, 6);
         $this->assertEquals([1, 0, 2, 0, 3, 0], $embedding->toArray());
         $this->assertEquals([0, 2, 4], $embedding->indices());
-        $this->assertEquals([2, 4, 0, 3], array_keys($pairs));
+        $this->assertEquals([2, 4, 0, 3], array_keys($map));
     }
 
     public function testFromString()